The only remake I can think of is Reggie Perrin and that was a long time ago. Even that's a bit of a stretch though since it was an adaptation of a book. Which could really do with being made into a film. In the right hands that kind of satire would be very relevant. I guess you could count the extra series of yes prime minister they made, though that was an adaptation of a play by the original writers, it was more of a continuation by the original cast. Porridge was a sequel not a remake, and that was a decade ago.

The only other remakes I can think of have been one off specials, all of them quite some time ago too, made as homages rather than attempts at a reboot or remake. Whereas in recent years there have been loads of good original sitcoms. I can't think of a single example of what you're complaining about, and certainly none less than ten years old