There's many that would make the experience better for Geyser users and many other Lightning services.
Two that come to mind:
  1. Recurring payments and subscriptions through BOLT12: Geyser users could subscribe to projects in a Patreon-like model to support their favourite Bitcoin builder or creator.
  2. Easy non-custodial solutions to onboard new users (eg: Breez with GreenLight) could lower the barrier to entry for new users that wish to keep full custody but don't know how to manage a node.
Working with Lightning is exciting because things are moving really fast! We're hopeful all these features will become reality soon.