My preferred style of "everyday training" is strength training every few days, cardio most non-strength days, and walking a minimum number of steps every day (cardio counting towards it).
Push + pull + lower is generally enough to get fit and healthy, yes. It could be a good idea to split it more like push / pull / lower front / lower back, because things like squats tend to work the quads way more than the hamstrings or glutes.
It's not sustainable though. The idea is to dive in, figure out what to fix, then fix it into a system you can stop micromanaging. Otherwise you just won't have enough time to do the other important stuff.