I think the “more dislike” you’re hearing comes from a vocal share of the fan base, not from a company looking at the demographics of its readership. And it’s hard to miss the fact that “male set games are more common” than the alternatives in the gaming world as a whole, despite slight movement toward rebalancing in recent years. Personally, even as a cis male reader, I’m more interested in the growing number of games telling stories with a female or femme protagonist, after so many masculine game MCs for so many years.
Some of my favorite ChoiceScript games are genderlocked – Guenevere, Study in Steampunk, and the Infinity Saga leap to mind – but as I’ve said before, I don’t personally feel that adds anything to my enjoyment of them. And I’d class Sabres of Infinity’s protagonist as a genderlocked but not a set MC; to my mind, a real “set MC” is an Aloy or Geralt, whose history, personality, and pre-game relationships are all given rather than chosen.
I’d quite enjoy seeing more of those in ChoiceScript… with or without a genderlock, which is for me a decidedly secondary feature of a “set MC.”
I don’t think I’ve ever heard anyone express this idea, and certainly not experienced it. The history of gender in games doesn’t suggest that game writers have on the whole had too much trouble coming up with plots for men.