Honestly, a landing page for me is just another thing I need to mess with. Bookmarks and using keywords to load them is so easy. Once they're in a bookmark, I'm just using keywords to get back to wherever they are. Super easy.
I wouldn't. People can bookmark their own things. Honestly, with browser histories being so readily accessible to recall sites anymore, I feel like isn't a problem that people struggle with. Probably why you're not getting much traction here for your specific angle.
On top of just putting all the links in one place; it was really nice to combine a bunch of information from each service to view in one place.
Now I can look at a single page and see with a quick glance; what+how many items are queued in Radarr/Sonarr/Lidarr, what's queued or errored in Tdarr, item count/time/speed in SabNZBD/Qbit, who's streaming what in Emby, and even CPU/RAM usage across multiple systems. (not pictured)
I'd recommend exploring it, I didn't think something like this was worth it until I actually tried it myself.