That's nonsense. Efficiency only matter if blockspace is exhausted.
You're worried about scaling when monero fees are fractions of a cent.
Discussion
I think that we need Bitcoin native privacy solutions. I understand that currently monero has very low usage, but it’s even more inefficient than Bitcoin L1 in terms of data per transaction and throughput, which means that it would hit limits very quickly if people actually wanted to use it.
Advocating for monero/Bitcoin atomic swaps as a privacy or payments tool doesn’t seem reasonable to me, for a variety of reasons, but that is one of the main ones.
You're worried about scaling because you think 8b people might be "on boarded" over night. You're an idealist.
The pragmatists just want to use what works today and also maximizes their privacy.
IMO, the way towards freedom is realism, not "hope".