As a kid and teen I struggled to define my own dysphoria when I look back at it in retrospect. As a kid, I thought I was okay with my body but looking male would be "better" somehow. I didn't know how or why. I felt jealousy, but at the same time I didn't really care if I was male or female. I had too much other stuff on my mind with being bullied and then the aftermath of having been sexually abused by two of those bullies. When I entired puberty I did feel distress over growing breasts but looked forward to getting periods (although instantly disliked actually getting them). I idolised looking pre-pubescent again but didn't really wish for male genitals and how I saw my gender kept switching between male, female and neutral. I preferred wearing feminine clothes over masculine. So I would say I had a slowly developing atypical form of dysphoria that was very uneven as I grew up. If it had to do with the abuse or not I can't say for sure but I think it was a factor in my confusion, and understanding myself in general.
I realised I was trans first when I was 15 but quickly shunned that realisation and made the decision to "try to be female" instead. Then followed 4 years of denial. I don't remember having actively been aware of much of any dysphoria during most of that time, likely because I kept telling myself that it's normal to be insecure about one's own body while I buried my true feelings in some kind of drag queen costume 24/7. I barely lived day by day and couldn't see a future. It was just "this day, then this day" cause I was more often suicidal than not with repeated attempts and never had any luck with getting medications prescribed that would actually work and not do more harm instead. Self harmed a lot and made it my hobby to romantisise mental illness.
At 19 though, my buried dysphoria started blowing up in my face as I couldn't contain it anymore. My feminine outfits started feeling like prison cells reminding me of the lie I was living, and the lie itself somehow made my dysphoria much worse even after I had stopped trying ty hide from myself. Then nothing I did to try to calm and treat my dysphoria seemed to help instead, while waiting for hrt. I knew I saw myself as a guy in my mind and desired a male body, but I didn't know up until then if that was the main issue or even an issue at all for me. Upon realisation, my dysphoria was mostly centered around my chest, genitals, over all curvy body shape and lack of male secondary sex characteristics, but it didn't reach that point until I was 19-20. Before then everything was just a blur that I couldn't sort out.
My mind has always been very chaotic and it's been a lifetime struggle to separate and understand most of my thoughts, feelings, comforts and discomforts. Usually I don't notice something is wrong until it explodes in my face and is extreme. The finer nuances get lost in the general goup that is my mind. So understanding what dysphoria is, if I actually have it, how I experienced it, if I'm actually trans or just delusional, and if transitioning would be the right decision for me - has been very difficult and those questions still on occasion pop up in my head when I get too entangled and lost in my own thoughts before I realise I'm just repeating the same questions that I already know I have the answers to by now. And this might not be so good, but the clearest answer I got to whether transitioning was really the right thing for me or not and if I really had/have dysphoria or not, was that taking T and having top surgery was a great relief and only made me far more comfortable with both my body and mind, and I wouldn't go back for anything. I feel so comfortable going about my life as a man compared to how miserable I was trying to live as a girl/young woman. So ultimately I know by experience rather than by thought.
So with that wall of text and a bit of oversharing (I don't mind though) said, my own idea of what constitutes as dysphoria may or may not be like anyone else's, but it has given me an idea of what it could maybe be like for kids and teens of today who say they're trans without dysphoria. Cause it's really not easy to know what constitutes as dysphoria and what doesn't. I've seen a lot of misconceptions going around about it and... I don't know, but I want to believe it might all just come from misunderstanding. I too think that dysphoria is a requirement for being transsexual. I personally prefer saying transsexual instead of transgender, but say "trans" as short for both, I consider myself transsexual but don't like using the word transgender for myself cause of what's going on debate wise regarding that word. I don't "identify" as being trans though, cause to me it's just something I have to deal with, and not an identity. In my opinion it is a medical condition with dysphoria being the symptom. I don't know how to respectfully word my opinion on what I think about identifying as trans without dysphoria if it's not a misunderstanding, so I'm just gonna shut up about it. All I can say is that I don't agree with it, and I have strong feelings about it.