If you are talking about future or alternative systems, I could see PvP Training Grounds being a solid addition, if the conquest gains were meaningful. But for me, Comp Stomp has felt more repetitive and boring than crate raids. If you have another system that would work for new players and alts in mind, though, I would be curious to hear it.
I actually view crate raids as World PvP. When I put groups together, my goal (besides gearing my alt) is to wipe other raids. From my experience, the Warmode sharding system tends to funnel raid groups into the same shards whenever possible, which is how I prefer it.
That said, it is not nonstop combat. Sometimes players want a swift, cozy experience of mostly racing around to loot boxes until they get to the gear level that is acceptable to them for pvp.