I’ve also experienced minor difficulties with note titles. To illustrate, I had a note on ego depletion; the note’s file name at first was “Willpower is limited,” which I then linked to a bunch of notes. I then decided to change the name to “Ego depletion.”
That of course disrupted how the note was used in the different contexts of other notes, i.e. …keep in mind that [[Willpower is limited]]. became …keep in mind that [[Ego depletion]]. And so whenever I would need to rename notes, I would have to go back to its backlinks to see if the name change has disturbed its usage in other notes, which is a hassle when you have a bunch of backlinks.
Sometimes I do feel that it makes sense to link to notes the way that Andy Matuschak does and the way that I did in my example above, and sometimes I end up feeling that UIDs are much better as I don’t feel overwhelmed to decide on a concrete title on the get-go.
By using UIDs, I would need to use pipes every time I link to notes; though it’s certainly less hassle when changing the note’s title as custom text on links do not change, it’s also annoying to see an extraordinarily long link when I’m in edit mode (a bit of a nitpick-y complaint but it’s what’s appealing about linking with note titles instead of pipes).
I think my problem above would be mitigated once WYSIWYG mode becomes a thing. And as been mentioned in previous posts about UIDs in Obsidian, the difficulty of finding notes with UIDs as file names would be somewhat mitigated if we are able to use H1s instead of file names (this feature request: Use H1 or front-matter title instead of or in addition to filename as display name). That said, I don’t think the debate on UIDs in Obsidian would be resolved if the devs decide to implement these as people will continue to decide for themselves which would be the right route ¯\_(ツ)_/¯.