I think the idea behind the folding form factor is that you don't have to lug it around, since it's in the same shape as a regular phone whenever you're not using it (and I don't think people consider having a phone in their pocket "lugging it around").
as a person who has daily driven a fold for almost 2 years the "crease" is a complete non-problem when you are using it. its mostly just people who havent actually used it that complain about it because they heard some influencer complaining about it or they saw a picture someone took of it with a studio light blasting down on it at the perfect angle.
Nothing to do with "influencers", but yes I haven't really used it. My opinion was formed from watching other people's phones who have this and deciding I don't like it, and I'm not prepared to change phones to give it a try on the off chance that I mind not find it an issue.