My comment was aimed at people who proclaim that they will never use an adapter, or that they are always bad, some even claim that the adapter has glass in it that degrades performance. That's prejudging it as an adapter, without regard to the specific case in question. Of course, some adapters are bad and all adapters should be vetted because of this.
As for buying new EF lenses, sometimes it can make sense particularly if I want to use the lenses on cameras that aren't RF mount (e.g., my EF-M cameras). But that consideration certainly won't apply to everyone. If you're in a position where you own nothing other than RF mount cameras, then the only reason I can see to buy a new EF lens is if you judge it to be nearly as good as the RF one, but significantly cheaper....