Thank you but to zap you must manually pay via LN using the LN code or QR.

If you dont have an attached sending wallet and do not manually send a zap via LN then the SNs payment system will tend to send CCs, not sats, much more often because without a sending wallet SNs will automatically prioritise sending CCs.

If however you attach a sending wallet then your use of LN and sats will be maximised automatically and importantly all other SNs users and content consumers will have verification that you have set up to maximise your use of LN and sats.

With only a receiving wallet attached it is impossible for others to know if you are maximising your support of the LN or not . . . without you showing a gun they can reasonably assume you are most likely not.

Showing a sending wallet verifies to all others that you are maximising your use of sats and LN.

https://m.stacker.news/130952