@EA_Aljo I think
@TTZ_Dipsy just brought the rink size and different plastyles up as an example, although I don't know if someone has suggested them. I think the current EAs european sized rink is "close enough" to represent those. And while more authenticity would be awesome I totally recognize the amount of resources it would require, as you said it's an NHL focused game.
I just wanted to point out to TTZ_Dipsy why it's not bloated having the current amount of leagues in game.
Yes, roster sharing would definitely be something that could help with those rosters, let's hope it happens.
As for the rosters, I think many euro players, especially the lower rated ones, are underrated in game in terms of their OVRs (like 5 OVR points or so), there shouldn't be really that many players at 50s OVR, which makes them lower rated than many players in the junior leagues. You can notice it the other way around: players returning from NA to European leagues have highest OVRs by clear margin, while they're not that much better irl. And in that the top NHL prospects are the highest rated in their teams even though they're actually often not the best players in those teams.