I've talked about this with my wife before because I had the same opinion as you when I was younger about how I liked the "more natural" look, without realizing what that actually meant. It's a lot of ignorance on the part of us guys because, well, most of us have no idea how makeup works lol.
A few things I learned:
- Yeah, women put on makeup either for themselves or sometimes, for other women. For example, if she's going to an event where she knows lots of women will do themselves up really nicely, she may do the same to not stand out.
- She had her makeup done by a professional on our wedding day, and like you, she thought the makeup artist was laying it on thick too. She asked the artist about it and the artist said "don't worry, it'll look good in pictures," and she was right. Both me and my wife agreed that she looked a little overdone in person, but she looked great in photos. Which is probably exactly what the artist was going for.
- Makeup is one of those things where doing it well is about making it look like you haven't done anything at all. A lot of makeup is about going for a sort of "effortlessly pretty" and "natural" look, when in reality someone probably busted their ass to look like that. But the whole point is that no one else is supposed to know how much effort went into it except you. So, when a lot of guys (including me when I was younger) talk about the "no makeup" look, they probably don't realize that there is usually makeup involved in getting that look.
- Yes, some girls really don't use makeup at all most of the time, and that's the look that you get in the morning when your wife rolls out of bed. But that's not the same thing as the "no makeup" makeup look.
And of course, makeup really isn't about you most of the time, unless she's specifically doing something for you. The amount of makeup she uses is just her preference on how she wants to look. It's no different from a guy preferring to shave or not.
IMO it's totally fine to think your SO looks best without makeup, but it's your own preference, and she may still prefer to make herself look a certain way for the world even if you think that way. But of course, your SO will always look great to you in any situation, in any level of dress.