BL2 and TPS were still being supported when THC was released. Excluding issues specific to THC, subsequent fixes weren’t because of THC’s release, but part of a regular, ongoing series of fixes. Much of what is in those patches were fixes and changes made years before in hot fixes that were made permanent in a patch.
Remember when people found a way to raid the Treasure Room in Captain Scarlet ad infinitum, and it was fixed immediately? And then someone found a way around the fix, and they fixed that, too? And when a player could get to the end area of DP to fight OMGWTH and get the pearl without fighting through DP, and then they fixed it?
They don’t like players getting the best gear without doing something for it - fighting a raid boss, completing a mission, killing a mini-boss many times, completing a game.
This is the “be careful what you wish for” part of bug fixes, because if people want bug fixes, they might get what they want, but they’re going to get what they don’t want, too.
If there are going to be bug fixes, there are two glaring bugs at the top of the list, and some of the people who want added features and bug fixes aren’t going to like those particular fixes.