That's a bit tangential to the point though. Wotc made attunement slots to simplify body slots & move away from the "christmas tree effect" and designed many of the items to be more impactful and removed safeguards that existed when decking out a character in magic items was possible and designed the system's underlying math so it never considered the presence of magic items. All of those together cause things to rapidly slingshot into the deep end of unbalance caused by extreme christmas tree effect while removing room for a gm to give out occasional magic items that play well within the powerscale of a given level.I'd forward a slightly alternative take. Magic Item Attunement is a solid design element, they were just overly aggressive with tagging items to require it. Attunement should be reserved for major items you want to lock to a specific user or prevent too much stacking, not minor items like a Ring of Jumping. If an attunement requirement was a bit less common the cap would be a lot less oppressive.
I'm sure that there are tables that like the way only using attunement slots to limit magic items that exceed the system's math the second they are available in almost any form. That's great if someone likes it, but wotc also declared all other use cases of magic items within a campaign unsupported & out of scope for 5e by not even supporting them in optional rules & coding the system math against trying to add them back in.