One thing that I think this semantic discussion is revealing is that there are multiple things being referred to as sexual orientation.
Is orientation about who you are physically attracted to and want to sleep with?
Is orientation about who you are emotionally or romantically drawn to for falling in love or intimacy?
For many people, these are nicely aligned. For some people, they might not be. Those describing pansexuality are often speaking on the "intimacy/emotional attachment" spectrum, whereas other people are often talking about the former.
This is why researchers trying to label people with sexual orientation have come up with terms and phrases to account for the differences here. For example, there are people who have same-sex partners for sexual encounters often enough to matter (e.g., for public health statistics), yet would never self-identify as bi, because they don't date same-sex and have no same-sex relationships.
I don't care how anyone labels themselves, but I do dislike the othering that happens when trans is treated as its own category.