Doesn't Twitter directly suppress such links? I remember there was a crackdown on people linking their mastodon accounts a while back.
And external links in general get a huge suppression in the algorithm because Twitter does not want to recommend tweets that take you off the site.
The platform actively fights you if you want to move elsewhere (which should really be a telltale sign for you to move), so I get why some orgs struggle with that decision. Doubly so if your job relies on the platform's outreach.
Agree with you, OsmAnd is practically unusable for me due to the ancient UI. I hated it every time I used it.
I found Organic Maps to be a decent modern alternative. It's open source and uses data from openstreetmaps as well, but it's a million times less cluttered.