People are just used to it and see it as part of the rules so it becomes fine... Not to mention anyone can homebrew whatever they want in their table top game so it's whatever i seen people make rings, change spells and all sorts of stuff hehe.
There is a difference between what you can homebrew and what you should.
Here a simple example:
Crossbow Expert:
If you ignore the rule for needing a free hand to be able to shoot multiple times you actually give the player the option to wield a crossbow and a shield, so not only do you already have one of the most potent dealer combat styles that actually can deal damage up to 120 feet, but also it gets an +2 AC compared to two-weapon styles/great weapon, this combined with an dexterity build (at level 4 with a variant human you can have dex 16 with studded leather and shield for 2 attacks with sharpshooter and crossbow expert while having an ac of 17). Its a small tweak that many do because they think its unconsequential and cool to fullfil player fantasy (for example the youtube channel Dungon Dudes, who also more than ironically complain that crossbow expert is already overpowered and dominates the meta).
Feel free to do your homebrew, but I'm for sure utterly against removing concentration in 5e without a complete rules overhaul.
