Welcome!

Interesting question, it will be interesting to see the responses.

For me, I think it’s actually easier to play a low C for longer / less effort than humming a low C.

I may not be a very good hummer…I don’t typically sing and haven’t been doing the “MmmmWwwaaaOooohh” thing for a while now as I just feel like I “get it” now and can find the right setting in other ways now.

I just did a little experiment, and I only lasted about 20 seconds humming a low C but lasted about 50 seconds releasing the air into the trumpet.

My $.02 FWIW.