I'm going to jump in on this discussion. First, if you are a league player, then you should set your tilts on your own games to be the same as the general league games, so you can practice effectively. (assuming that you have a few games at home).
If you play on a game that has a tight tilt setting, then you can only practice your subtle nudging skills for that setting, so if the league games are set tight, then practicing with tight tilts will allow you to play better for that setting IMHO.
With that said,
I hate playing pinball machines with tight tilt settings and won't pay to play them. I come from the EM era and those games required a lot of nudging skills (that I'm fairly good at), but they had no tilt warnings, so a tilt was the end of ball or end of game. So, for the EM era, most games were set to a loose tilt setting compared with typical modern tilt settings.
In other words, I find that part of my enjoyment from playing is from effective nudging. I have my games set to medium to loose. This means that standard shaking will not give me a warning and a hard nudge will give me one or two warnings, I have the tilt set so that the cone hits the ring near the top of the cone.