I don't have a problem with stealth being equivalent to magic, that's good for the martials. I do have a problem that being hidden is MORE than being invisible. In many ways it's a combination of Invisibility and Silence, but you can willingly end both.
Because D&D doesn't using facing and breaks movement up into choppy rounds, I can somewhat envision that being out in the open and not losing stealth could be feasible (ye olde "sneak past the guards while they're talking to each other and/or distracted" or "sneak up behind someone"). But I think it should be noted in the rules that if you don't have some kind of obstruction in the way your stealth should be at disadvantage at the least (Passive gaining a +5 bonus). It assumes your still trying to be sneaky, passing by when the observer is distracted or looking elsewhere. If the PC does something blatantly stupid or irrational, the DM should treat it as the PC willingly dropping the stealthed condition, regardless what the rules say.
One thing I find unusual - in 2014 5E, if move more than half your movement rate is there any penalty to stealth? How about if you dash? I don't remember seeing any rules against this other than you can't stealth on overland movement if you're using quick pace.