Um...plenty for what?
There is nothing more functional than the squat. Athletes use it because it helps them to run faster, jump higher or out-muscle players on the opposing team.
Also true in context. Everyone has to make their own determination as to when the risks outweight the rewards.
I've not heard of these...don't all squats use the legs? Do you mean lunges?
excellent exercise - use them myself to repair imbalances and strengthen the bottom end of squats.
To a point,perhaps. I find my deadlift stalls if I stop squatting and goes up as my squat goes up.
Another movement that depends heavily on leg and back strength in the pull and receive portions of the lift - Best developed by squatting...
Nothing wrong with the leg press as a change of pace.
It's a squat. therefore, It Is Good.
Really, it all depends on what your goals are. From your post, it looks like the goal is to avoid squatting. Seems like squatting would give you everything you're looking for, but you don't like the loading on the spine. Well, that's completely under your control. I'm not here to say that what you want is wrong,BTW. Your post reads like you're trying to find a way out of doing an excellent exercise. Why do you need an excuse?
Try out your scheme and see if it works for you.