I am not at all a fan of single set frays, let the competitive nature of having all available cards push for the necessity of the latest set, not the rules.
If CA is well-designed and properly compatible with RB, for example, CA will be purchased and played in all formats, brawls included.
We've been pushing to get the game to a place where we all have different deck compositions / levels / etc... - somethin I think we have all been looking forward to. In order to lean into that even further, I would much prefer see a flat modern / wild across the board. I realize that may not be possible, so a modern 1.0 (UT+CL), modern 2.0 (CL+RB), modern 3.0 (RB+CA) would be a cool compromise. Wild editions are a bit more difficult to systematically group up, but a rotating group of fray compositions (similar to one of our wild tourney series) would be awesome (and I say this without really having the full context of how wild players operate). Also, perhaps that modern system helps create very natural fit wild fray (ie., modern 1.0, 2.0)
All of this said, I’d be perfectly content keeping frays as simple as possible, modern and wild, each league & rf/gf
That's a really good point. If all frays were wild, for example, then it doesn't really matter what you're playing, but modern card holders will have an advantage with the newer abilities that the old cards don't have and that will encourage people to buy. So having more wild frays would make more sense to me than having more modern, because you can still play in wild with a modern deck, but you can't play in modern with an older deck.