I mean it is, but it might be less costly than continuing on the proprietary engine. CD Projekt and Halo both cut their losses and moved to UE5 as a compromise moving forward .
If CD Projekt, creators of one of the best RPGs of the last 20 years, thinks they can benefit from an engine switch I’m inclined to think they might be right.
As long as you aware that's an unpopular opinion, then it's yours to have.