He has though: that "youtuber quality" can be misleading as a criterium for iPhone video quality, as major youtubers nowadays use high end devices.

If you don't have video experience, then you might find it subpar when actually you compare it to impossible standards and 10x more expensive gear and lenses.

Sorry, it seemed to me that you didn't realize that you were comparing your phone to the same cameras used for actual film productions.

YouTube is not a shoestring operation anymore, filmed with whatever point and shoot digital camera is at hand, and for most even semi-popular creators it hasn't been like that for some time now.

I thought it would be constructive to point out that most pro or semi-pro YouTubers are now using top of line kit, with full post-production pipelines tailored to YouTube.

If you know this already and yet still expect your iPhone to match up, then ok, perhaps you're right and there isn't a constructive conversation here.