Not exactly?
If they make it work nicely on surfaces that aren’t perfectly straight, you could use it while playing on the couch.
Would be particularly amazing if games support switching between modes instantly, so you could for example be playing a game, open your inventory, slap your joycon on the couch to organize your stuff w/ mouse mode, close your inventory and pick it up resuming play in joycon mode 🤯
Sounds like they should be selling an adapter of sorts for the RingCon and Leg Strap