things did change, they no longer even offer it for anything except apple products, so if you want to use safari on windows it’s 11 years out of date, and any other OS is just a full on no. So yeah, i’d say we’re back to firefox as the only real alternative.
i still have to use windows occasionally, and just run thunderbird on that. When on linux i use aerc because i way prefer terminal applications in general, but also i am lazy and the setup took about three seconds vs. mutt which requires a bit more work.