Indeed, Trans people are actively saying "Listen, if you won't cast a trans person in this role, at least cast a cis person of the appropriate gender in the role." We've been saying it for a long time. In the case of this most recent role, We even have a great option - Oliver Platt, a "name brand" actor, is a DEAD RINGER for Tex. The only problem is he's 6'3", but I feel like we can work around that. Platt's got a bunch of award nods, he's been in a bunch of notable films and tv, and he looks like the guy (unlike Johannsen). In regards to situations like Transamerica, and Boys Don't Cry, and other older films, we need to look at them through the lens of history. At the time, just making a film about a transgender person was groundbreaking. Just being represented, even though it wasn't by a trans person, was huge for the community after decades of being seen as nothing more than sex workers and murder victims on screen (of course, Brandon Teena was a murder victim, but at least we got his story first instead of just his dead body at the beginning of a Law and Order episode). Transparent had criticism from the trans community right from the very beginning, but it was hushed for the same reason - popular show with a trans main character, we should be grateful. Then it came out that Tambor abused the trans women on the set (as well as women on other sets, such as Arrested Development), and all of that criticism came back like a dam had broken. "We told you so," "why didn't you cast a trans woman in the role in the first place", etc. Basically, the trans community is sick of being the equivalent of Alec Baldwin playing Harriet Tubman. We get it, you need to make money to make a film, but there are so many better options than what you're choosing and it's like you (by you I mean the industry) are trying to be tone deaf.
All while balancing out the market forces that - lose their shit when the human torch is black - terrorize Leslie Jones for being a woman or something - goes batshit over a black James Bond I have no idea if these statistics are accurate, but if 0.58% of the population of the US is transgender, that means that less than half of one percent of less than half of the entertainment market is being misrepresented to everyone else. It also means that if more than one in 200 roles is transgender, then transgendered people are being over-represented in Hollywood. I'll bet that number is under 1 in a thousand.
I don't think they're intentionally tone deaf. It's my opinion that the rapid advancement of the trans rights movement compared to other civil rights issues makes it difficult for people who may be well intentioned to treat the subject with respect. As you point out it was a community that accepted crumbs like 20 years ago and now has the international attention that other LGBT communities gained over a longer time line. Public opinion on vanilla homosexuality changed slowly and at this point people who may still be against gay rights seem to feel like they've been tossed unwillingly into the deep end of an issue related to something they are at best uncomfortable with. Anyway I don't envy studio heads who have to make decisions about LGBTQIA topics