Hello! You may also use Grid Modeler for boolean cutting hair😇

this would be good if the topology wasn't effected poorly by it. Having it done this way only really works for hair that's not supposed to move imo

Yes you have to retopology it. Just as the OP use boolean modifier then it has to be applied.

I get to the same result by moving vertices here and there, but this seems like a much more efficient solution 👏🏽

I have to follow you again here since your Bsky seems abandoned

is that a modifier, I couldn't understand it very well

No modifier here. Grid Modeler is an addon for direct modeling. You can just google "Grid Modeler".