Most games, not just RPGs, have some sort of gameplay bloat, usually based on tradition or bad design.
This usually happens when multiple gameplay systems are created to facilitate the same gameplay purpose
For instance, Doom Eternal has 2 separate systems to counteract the "just use the Gauss all the time" problem in Doom 2016. It introduced an enemy weak spot system which encouraged you to use different weapons without forcing it, and rewarded creative players who prioritised certain targets at certain ranges. That's good. They also capped all the ammo amounts towards the same goal, a decision which many people (myself included) absolutely despised because it felt artificial, was a very binary system (no encouragement or strategy, just a case of "lol swap weapon now"), and is generally a very hacky and heavy-handed solution. I would call this system bloat because it's not really fixing anything that wasn't already fixed, and just makes the gameplay tangibly worse in a number of ways.
Any mechanic that exists that doesn't fulfill a purpose, or fulfills the same purpose as another mechanic, is superfluous, unless there's something specific about that mechanic to differentiate it from others for a very specific design goal.
Modern AAA games are plagued with superfluous mechanics that just add busywork. Enemies dropping ammo was replaced with crafting systems, with enemies dropping "ingredients". Why? What purpose does that serve? One could argue that theoretically this gives the player more choice as they can use their resources on other things, but realistically the only things ever worth crafting in these games are medical kits and ammo, both of which could easily be dropped by enemies. It's a whole extra system that requires it's own scripting, menu system, art, etc, and accomplishes almost nothing. But they HAVE to add crafting because it's what every other AAA game has and the executives need to check a box.
I am not against crafting systems. They can add a lot to a game if done right. But they are so easy to fuck up.