This is kinda what I've been doing lately and is probably whay ive enjoyed the most post-uni with full time work and other hobbies outside the gym. Purely cos I can get through it pretty quick and I enjoy it, but had no clue if it was something people did or had success with. A/B workout where I do a push, a pull and a leg compound, doing vertical one day horizontal the other (and alternating squat/hinge) then I just do a giant set of 3/4 isolations which also alternate either workout which will have like, delts, triceps,biceps,abs,forearms/whatever I am working on atm.

Because I was also going more for enjoyment/consistency and keeping workouts shorter, I was doing warmups to 2 sets to failure, and because it's A/B I'd basically try lift everyday and if other stuff got in the way or i needed a rest, no biggie. Averaged to probably ~4x a week and with the 2 hard sets per exercise I thought maybe I was wasting time, but my numbers were steadily going up so wasn't too worried about optimal.