Over time we've gone from Gap of Rohan, Wonder and Setons to more of a Dual Gap and Astro dominated situation. While I'm all for letting people play what they want to play do you think perhaps there's some way to nudge people back towards playing less turtling maps? Encourage people to get out of noob mode into more of a mid range. Maybe I'm wrong but it felt like there used to be a broader range of skill levels before now it's sub 1000 and 1500 plus with less in between.
By contrast maybe having less choice on ranked games might make things a little less intimidating for people? I don't know perhaps when the pool was limited the learning curve was harsher because you'd to learn map specific start builds. Now there are so many maps the lower and mid range players can be bad in ranked play giving you more of a chance without getting so specifically nerdy to look up build orders? There's an argument for narrowing the pool a bit at least because some of the maps are absolute trash. They were trash 5 years ago and somehow haven't been revised!
I'm just concerned that when you give people too much choice (in hosted games) they end up picking the maps where there isn't a lot of choice and games play out the same way over and over. I saw TA Spring die to this both in maps and mod balance. TA definitely suffered from this too. It's a tricky situation if you're going to make installing mods and maps so frictionless it's not like there can be a prescribed balance from the developers.
As a broader and more controvertial suggestion I wonder is this a symptom of the game being micro intensive where it doesn't need to be. Commander requires move orders. Mex upgrades require 4 mass storages. Units have low armour and die quicky if not micro'd. Understanding all the elements of reclaim. In a parallel universe where these things were more automatic would people try play defensive maps where they could concentrate on these things exclusively?