I do a lot of camping. So, when I find a good spot, I like to save the location, in case I want to go there again.

I also bookmark quite a few distant-ish places I visit semi-regularly [even though I know the way there] as I like to use the 'distance to destination' and 'ETA' read-outs to monitor my progress.

I also do things like bookmark that nice pub or restaurant I stumble across while on holiday somewhere, so I know some decent places to go, if I'm ever in that area again.

So, yes. My usage of mapping apps is a bit more 'archival' than the transitory way someone like a taxi or delivery driver might use them —which is why I need to be able to import my existing bookmarks.