Fqqs, you're over thinking it!
In terms of waiting until you hit 10, 10, 10, 10 etc - this is a common prescription given to beginners (ie someone who has never trained before, the complete novice). It is a measure used so they don't progress too quickly or injure themselves.
As you start lifting heavier weights, you need to break barriers. You might struggle at a certain weight to get 4 sets of 10, so you can do things like overload (put on 5-10kg more, and do less reps) then go back to the original weight, and you may be able to push out 4 sets of 10 in subsequent sessions. Lifting heavier weights and doing only the negative can also help in this regard.
You will get benefits across all lifts too, some of them like shoulder press impact your flat and incline pressing. On the lifts you feel you can push a lot of weight, do so. I have noticed simply dead lifting / leg pressing / squatting heavier have aided lifts that don't relate at all.