Yes, lack of/weak fungibility has disadvantages. Argue that the advantages are worth it if you want.
Discussion
It's a tradeoff made witingly. Privacy scales on higher layers. At this point it's like arguing slow TPS is a disadvantage, which it also isn't.
Bad example. Look how terrible the internet is for privacy.
This might help you
https://twitter.com/parman_the/status/1765706733144752564?t=OyTHPkXdQjPZ_PYqtJa9_A&s=19
There are many things that are scarce that don't have a hard cap on supply. Gold for example.
Bitcoin is also not a unit of account or the most saleable good (neither is Monero or any other crypto)
A requirement of money that Bitcoin doesn't have (or weakly has) is fungibility (uniformity, indistinguishable), but doubt we are ever going to see eye to eye on that. Yes, I know lightning in isolation is fungible, or can be, but Bitcoin as a whole is not.
"You don't ask nicely that everyone else not spend your coins; You just protect them using a cryptographic key.
Similarly, you don't ask nicely everyone else not distinguish your monetary units; You just make them *technically* indistinguishable AKA fungible." -binaryFate