A lot of the big YouTube photography channels are just about flogging your their Preset packs or learning guides and don’t offer any real advice for the Beginner. Some of them can be entertaining, much in the way that Top Gear or Grand Tour are, however you wouldn’t watch them for a serious car review. A lot of the content is just regurgitated and some of the photos taken aren’t half as good as some of the ones you see on here or other forums. I remember watching Jared Polin shoot a blue Mustang car and the photos looked like snapshots, same as most of his recent photos of Bernie Sanders and AOC. That said he did a visit to Paris and a walkabout and it was one of his best videos I thought.
The types of videos I do Find useful from these content creators are for ideas in posing models or ideas for locations. I found Mark Galer on YouTube who is a Sony ambassador and has some good content relating to the Sony mirrorless ecosystem and of course some of it is transferable to other cameras, worth pointing out his videos can be long though but they are full of content and he explaining it in-depth and not glossing over it as per most of the channels.
The 25k Mac has really ruffled a lot of feathers around the internet but for 99% of photographers I don’t see it offering anymore real world performance than a £5k Threadripper based PC, however each to their own