I do not know anyone who has (or does) work at FogCreek.
But I can imagine a scenario where an employee leaves due to tech stack woes. The employee may not want to burn bridges during their exit interview by saying, "I'm leaving because this tech stack sucks: it's affecting my long-term career progression (no other companies use Wasabi); management is too slow to adapt despite our repeated kvetching; the 1 full-time guy who knows the language is overworked and doesn't have time for proper training." Instead, the employee just says, "I'm leaving for personal reasons" and everything is wrapped up nicely.
Edit: Glad to hear from other commenter that this wasn't the case at FogCreek. I have known people to leave jobs due to tech stack woes; they didn't tell management the real reasons why the left.
But I can imagine a scenario where an employee leaves due to tech stack woes. The employee may not want to burn bridges during their exit interview by saying, "I'm leaving because this tech stack sucks: it's affecting my long-term career progression (no other companies use Wasabi); management is too slow to adapt despite our repeated kvetching; the 1 full-time guy who knows the language is overworked and doesn't have time for proper training." Instead, the employee just says, "I'm leaving for personal reasons" and everything is wrapped up nicely.
Edit: Glad to hear from other commenter that this wasn't the case at FogCreek. I have known people to leave jobs due to tech stack woes; they didn't tell management the real reasons why the left.