They convert cryptocurrency to "fiat" during the purchase so it's not really what you want per se. I've heard crypto compared to gold in that most holders wouldn't buy goods/services with it directly but it somehow has value anyway. Obviously it doesn't have the same thousands year history as gold.
I don't think you can. It is too volatile to be used as a currency.
> Can I pay < .1% fees like I would with fiat and can I buy physical goods anonymously?
No. It is not anonymous and the fees are just as high.
> Or is it really just that I can send money to someone else? I've tried some googling but certainly not found anything definitive. If I don't want to "invest", why would I get BTC instead of cash for personal spending? Or is that not what it's for?
It is meant for peer-to-peer electronic cash. Using a wallet on an exchange defeats the purpose of 'peer-to-peer' and so does waiting for hours to send Bitcoins from one address to another which is slower than 'fast bank transfer'.
There are better cryptocurrencies and stable-coins suitable for that purpose.
https://www.coinbase.com/price/bitcoin-cash
The main difference being that BCH has lower on-chain fees (half a penny per transaction). And BCH does not have Replace-By-Fee (RBF), making it much more difficult (but not impossible) to reverse transactions maliciously. Adoption of BCH has been disappointing, as cryptocurrency continues to be seen mostly as a speculative investment rather than a replacement for cash.
You need a way to obtain Bitcoin (through a crypto exchange or by receiving a crypto payment from somebody else), and you need someone (a person or a business) to accept the payment.
It might be worth it for illegal stuff, buying drugs or for large international transactions. It's not practical for regular spending because almost nobody will accept it and the transaction fees will be high.
No. Its value is too volatile, its transaction fees are too high, its clearance speed is too slow, and if anyone rips you off you are reduced to begging.
What's a good replacement for fiat cash? Easy: fiat cash.