Yes, it is inefficient to mine but things like p2pool exist which are basically a decentralised pool.

About the KYC thing it is extreamly easy to erase any traces back to you. Just send it to another wallet and done. The fees are extreamly low. You can pay less than ¢1 per transaction. It is also easy to buy w/o KYC. Take a look at localmonero.co for example.

It isn't centralised like most L2 of BTC.

You can buy lots of useful things with it. Take a look at kycnot.me and monerica.

Anyways. This question was supposed to be directed at bitcoin maxis. Crypto in my opinion shouldn't be used to buy stuff irl. It should only be used for transactions online or fast transfer of value around the world.