Damn, sometimes I wonder if I did anything right! A hunnert years ago I learned how to make balls on the rail on dead cushions and ratty cloth. Things haven't changed much other than the amount behind the ball I can hit. Some of those old tables I could hit the rail a full inch behind a ball and pocket it, using skid and cushion compression.
Even today, if the only goal is to pocket the ball or if variations in speed will take care of shape I never aim at ball and rail at the same time if the ball is far from the pocket. The reason is simple, If I hit the ball a gnat's ass thick I'm gonna miss. On the other hand, if I shoot a bit rail first, granted not that full inch but more like an eighth to a quarter inch, more depending on the angle, the cue ball will skid on the rail or the cushion will compress depends on angle. Either way I nudge the object ball down the rail and it falls.
I did note that the video talking about hugging the rail often didn't! No need to hug the rail anyway and that was another thing learned. Balls near the cushion can be aimed at the middle of the sweet spot, halfway between the rail it is on and the point it is facing. Again, the reason is simple. This shot is a little more error tolerant. We don't shoot all the way to one side for most other shots, no reason to do it running down the rail.
In my very early days of playing pool running down the rail was a very hard shot for me. Once I learned the things mentioned here, it became my first cinch shot. A final trick, if you aren't absolutely sure neither tit sticks out, when the cue ball and object ball are frozen on opposite sides of the side pocket always shoot with low inside(nearer the cushion), walking the ball a hair out passing the side pocket and back into the object ball. This is a shot where speed, spin, and exact aim all matter but one easy to master with a little practice.
The rails often make shots easier. I don't think they ever make them harder unless you are trying to hit perfectly ball and cushion together or ball first.
Hu