Because your drug dealer only accepts bitcoin? Does anyone else actually use it? Other than as a get rich quick scheme?
Anyone who accepts Bitcoin runs into the problem where others can know their balance by looking up the address (and thus could be at risk for theft/mugging).
If people want to keep their balances private and not share their transaction history (or later transactions), they should use a coin that's private by default such as Monero.
Additionally, Monero has a dynamic blocksize, so as usage increases it won't experience the transaction backlog that Bitcoin faces.
You didnt say it is not yet in a tagged release, just mentioned no it isnt subadress but multisig, ehich tells me you had no idea
Either way, it doesnt matter.
I am kind of confused with the block size thing. Sure, increasing the size means more transactions can be added into the problem. Bu, as far as I know bigger block size has it's own share of problems - block propagation is slower which can cause double spending and frequent orphans means the blockchain has to keep re-organising frequently too.