Borderlands 3 has a beefy campaign as well. I literally play 3 out of the 4 to max level (then) & complete every quests (side & main) in the game.
The end game though (then. Now I am not sure) was borefest & hence I stop playing.
I beat then the hardest content (Mayhem 3 killer sharf or something) & there is no more interesting challenges.
I don't think Borderland 3 was designed with the end game in mind though, & it was nothing wrong.
Remnant was half decent, especially coop. I bought & play all the main & DLCs. The problem however is all loots are uniques with fixed stats (some like weapon & armors can be upgraded but has a cap), hence after picking up all the ones for your build & max them out, which did not take that long, there isn't much else to do. If there are different tiers of gears & slightly randomized stats, loots that only drops on higher levels, it could easily double the playtime.