Monero has a big disadvantage because it's very difficult technology and for normal people, it is very difficult to understand and send funds because Monero can't be seen if we don't own it directly? I don't know much about Monero but have created an address once and it's really difficult to understand compared to normal coins like Bitcoin and Ethereum.
For example, you can't prove a transaction really compared to normal coins like Bitcoin and Ethereum.
Because if we don't own it, we can see it like on Blockchair or Etherscan because Monero is not public.

Monero is victim of it's own privacy.
In addition, Monero is a DarkNet coin and we can suffer from crime and scam more easily because also Monero is also more difficult compared to normal coins like Bitcoin and Ethereum.
Monero is quite an exotic coin.