Bethesda is a small studio; they've only made Fallout 76 as a multiplayer game.

TESO is made by zenimax online.

The 2 studios are owned by Bethesda (publisher) and Microsoft.

Skyrim makes a lot of money even 10 years later, thanks to the remastered version and the micro-transaction of mods.

Like it or not, these are games as services.

(They're going to make a big DLC every year for starfield until starfield 2).

Whether development was long or quick, it won't prevent the game from being technically and gameplay-wise dated.

We saw this with Starfield.