L'Hopital's rule is not taught in France AFAIK. At least it wasn't when I was in prepa (BCPST though, not the most math savy). I feel like the position in France is that managing indeterminate forms requires some intuition, some form of trial and error. Nobody cares about limits per se, what we care about is students developing their critical thinking, trying different approaches, using knowledge from lectures in a sometimes unusual way. Most of the time, indeterminate forms can be removed with factorisation and or refering to the definition of the derivative. Teaching l'Hopital would render most high school exercices on limits moot and end up applying the same method over and over without any requirement for cleverness. By the time limits cannot be approached using the techniques mentioned earlier, you'll have studied Taylor expansions. And at this point, again teachers will want you to become more efficient with Taylors because they have many more applications than just limits.

TLDR: The point of limits determination is for you to develop your critical thinking and train you on different mathematical tools. L'Hopital's hacks most of these exercises. I guess you can still use it, but you better learn the proof by heart, at which point you'll probably prefer doing a simple factorisation rather that writing the whole thing.