Their app is predominantly a web front end. You could previously program your remote entirely via their website years back iirc. They had to program this component as you say for getting new remote profiles.

To be fair, why would they bother programming a ‘local only offline mode’ for your specific use-case when Internet connectivity was ubiquitous long before these devices were released?

Like yeah in retrospect it would be helpful now, but as a business decision it would have made very little sense to Logitech.