Of course people online have an opinion, based on their experiences and those of others and recommendations by different doctors and all kind sof opinions exist, if you ask 3 endocs you also get 4 opinions.
My opinion is that while we hate testosterone, it is more important to get estrogen and progesterone up instead of testosterone down. Women have testosterone as well. Think of it that way - your goal is to feminize the body - how is killing testosterone helping that? You wont de-virilize because of a low T and you wont virilize that fast because of an elevated T (taking womens regular levels as a reference) - what needs to be stopped is DHT which is created from T via an enzyme which is what Androcur and Spiro and others do block - but P can block it even better. DHT is what makes the hair fall out in one place and grow in another place. Simplified...
Many patients seek to kill T because they have that experience about T shaping their body in puberty, because the see it as a symbol for male, because they do not want to have a sex drive for the time being. Not because having some T left would still (after being in the mid 20ies at least) make them grow taller or such. Because it does not.
I think these antiandrogens all have some side effects that are not great - they are having effects on stomach, liver, kidneys, your libido or your blood pressure. If they are not needed, they should not be taken or only in minor dosages.
I still wonder if there are any studies done that support the claim by some people that you need antiandrogens to feminize if you take Estradiol (and then of course you do not need Progesterone because you have no Uterus). In what way would this really interact? Testosterone is actually converted into Estradiol by the body. The female body has much more Testosterone than Estradiol - did you know that? In contrast there is solid evidence that Progesterone is needed for Estradiol to work properly. Antiandrogens simulate some of the properties of Progesterone IIRC , so maybe they can help some things, but honestly why take such a thing if P is available...
But that is just my opinion now - formed by recent explorations and support after taking the stupid combination of Estradiol and CPA (antiandrogen) pre-op and Estradiol only post-op and having not feminized as much as it would have been possible with that therapy and even lost some passability 10 years into Estradiol monotherapy.