Key #1: Steady Head. I think it's impossible to make good contact without this, so it's unlikely to ever result in a satisfying shot. That, and making a swing with head movement is physically unpleasant, it's like paying 40$ an afternoon to have a giant person shake your brain violently 90 or so times, resulting in distress, vertigo and whiplash. That is not fun and it no doubt results in anger on the part of the person being shaken. It would be like getting forced to do a few hours of zen archery vs full contact jousting. You might not love the zen archery but it's unlikely to result in anger. The jousting seems simple enough but getting hit by lances and not knowing how to ride a horse straight would piss anyone off. Such is the experience of starting out in golf. Also, you're not doing anything good with the ball from swinging like this, so you shoot 150+ too.
Key #2: Weight Forward. I'd say one of the most important keys for solid contact and distance. If you can't hit the ball off the ground, this is probably why; being able to hit shots off a tee is easy and requires little mastery of the swing. You can enjoy breaking 100 on a par 60 where you don't need any long approaches or demanding tee shots though.
Key #3: Flat Left Wrist. Important, essential for power and proper impact, but you can still flip and hit a driver a somewhat respectable 220+ yards. Plus your ball goes high when you do this, so you can feel somewhat like you're hitting a proper shot. You could certainly have fun doing those things, however.
Key #4: Diagonal Sweet Spot Path. This one is important for building a big boy swing or a decent looking one, and it's unlikely to hit a straight shot without this. Yet I see so few people out there hitting straight shots so they must be finding a way to enjoy themselves. This one is important to have for a better player because you'd spray the ball and that's infuriating if you think you have a decent swing.
Key #5: Clubface Control. This is what makes strategy on the golf course possible if you have a decent swing. If you have this you can manage your misses a bit, so it can make your bad shots hurt your score less. If you can't control your start lines it can be infuriating but one can develop compensations to keep the ball on earth. You'll likely putt miserably though but being a terrible putter is excusable to most of the fellow golfers.
I'd say you need key #1 at least a decent amount of the time unless you're a masochist. Just the idiots telling you you moved your head after every shot, and there will be many (both idiots and shots), is enough to make anyone run himself over with a cart to end the misery. A dash of 2 and 3 are essential to hitting solid shots consistently, which any handicap golfer is hoping for. Some proficiency in 4 and 5 are needed unless you enjoy or tolerate looking for your ball every hole, but generally being inaccurate and/or short is acceptable to golfers, socially speaking. If you can't hit a solid shot and do nothing but duff it because you lurch violently on every shot, you'll do terribly and no one will want to be in your group.