We work for years getting really good at getting down in our stance in perfect alignment with the shot, the line between the cue ball and object ball that will pocket the ball. Then with back hand english we twist off of this line. The more side spin we use and the shorter our bridge the more we twist out of line or swing our grip hand out of line. I do suspect this is why a longer bridge is in vogue these days but I'm often not thrilled with backhand english over this issue.
Fore hand english works pretty well and since my body and grip hand is in alignment with the shot it actually "feels" pretty good. I have shot like this and other than resetting the bridge after I decide on the english I want to use it works just fine.
A combination of front hand and back hand english works and if you calculate things correctly and the phase of the moon is right no compensation of your aim is required for most shots.
Parallel english is nice. You line up perfectly, decide how much side you want, and offset that slight amount front and rear. Since there is no pivot point the offset is minimal at the grip hand. The downside is that you do have to allow for the modified path of the cue ball in almost every shot. This is still the method I normally revert to, I suspect mostly based on HAMB.
Now I am going to drag out another compromise that works well, using parallel english to get about half the side you want and back hand english to get the rest. Usually keeps you from having to do any radical realignment after you are down and reduces the need to calculate the cue ball's path.
I'm sure there are other ways of doing things. We could do parallel and front hand combined and that actually works well, I just don't like resetting my bridge once I am down on a line. We could also use a combination of front hand, back hand, and parallel englishes, should confuse hell out of everybody including ourselves.
How to apply side is definitely one of those things that it is best to try the various methods for awhile and then decide for yourself what you are comfortable with. All common methods work and work well.
Hu