Sorry, I wasn't referencing you, for "me". I am guessing you like monero for the privacy? Which I can understand, but in Japan paying under the table with cash (very common) gets me a similar type of privacy (maybe not for large purchases).
Discussion
That's why it's called "electronic" or "digital" cash
Physical cash is nice locally, but you can't use it to transact instantly over large distances with anyone on the planet
A few other downsides with physical cash:
-Can't carry arbitrarily large amounts.
-Vulnerable to confiscation and theft.
-More difficult to verify authenticity on-the-fly.
-Issuance is centralized, unpredictable, and doesn't require PoW.
-Not as easily divisible (Need to carry specific denominations and change)
-Can't trustlessly exchange for crypto (no atomic swaps)
-Can't have multiple people with simultaneous ownership and control over the same cash (multisig)