What Sync does is not only "sync", it also helps Obsidian remain profitable and 100% user supported. Subsidizing costs in pursuit of growth is what got Evernote here.
> * it also helps Obsidian remain profitable and 100% user supported...*
100x this.
More than paying for a feature, subscribing to Obsidian Sync is a great way of sponsoring the project, and hoping that these folks are successfully enough to make a living and continue to pay their talented engineers for as long as possible, without going down the rabbit hole of VC funding and stock market.
What Sync does is not only "sync", it also helps Obsidian remain profitable and 100% user supported. Subsidizing costs in pursuit of growth is what got Evernote here.