As you did search for similar topics in order to not open yet another wish list topic you could even have called the topic “Jasonm’s librem 5 wish list”.
For others see:
For your posts regarding which apps you need, you will probably also already have seen the very good posts by Caliga
And there’s also a video on contact, calendar sync via the native gnome function in the qemu image:
Backup has it’s own news (also linked in a post above):
Instant upload of photos would probably work if you just use the nextcloud desktop client which you can probably use good enough with the newest desktop-modes on the librem 5 shown in the news recently.
Webdav should not be a problem either as this is there in gnu/linux.
Mapping app is also shown in the AMA videos. Wireguard and vpn are also already there in gnu/linux, at least if you use it as you would on the desktop.
So I would say you can pull the trigger, but don’t trust me, look all those sources I linked and happy buying.