Excellent points here.

There is a setting in Phoenix about automatically splicing in additional sats if the transaction exceeds your available inbound liquidity. But this is an on-chain transaction which can really hurt if your transaction is small and the fees eat most of the transaction. Imagine paying $2.50 in fees to receive $3. Instead, you could manually send a large transaction from yourself, pay $$3 in fees, and then send your own sats back to the original wallet to free up the inbound liquidity.

I would add a comment about the “add liquidity” button.

If you are planning to use it as a business, maybe as a one time at a farmers market, you may want to consider adding liquidity. This is where the company behind Phoenix will add a bunch of inbound liquidity in the amount you select. Looks like they charge 1% plus the miner fee to have the liquidity for a year. And I can select between 100,000 sats and 10,000,000 sats liquidity.

Nice feature if you find yourself a sour to make a lot of sales and didn’t prepare the liquidity ahead of time.