So sorry @Louloo just saw this - yikes!
Ok so at first I thought the same thing you did. That my hair would grow back tenfold and it would be darker and thicker, but not at all.
The razors that I use are only one blade and they’re not exactly the same as regular razors that have 2-4 blades. I do it twice a month to remove little fuzzies, to exfoliate, and because it makes my skin super duper soft. Plus, when I put foundation on it loooks FLAWLESS because there aren’t any little hairs in the way, so it looks really good.
Having said that, I obviously can’t guarantee that your hair won’t grow back thicker because I’m just not sure how it works. All my life I’ve been told that women shouldn’t shave their faces for that reason, but now it’s looking like that might have been wrong? I have several friends who are also doing this without any issues.