That's a clearer explanation as opposed to what's written in OP. I agree games disappearing off the front page deters people from playing comp games.
This website is far past the point where having ranked and unranked games in main lobby makes sense.
Both sandbox and main lobby suffer from this weird choice. Unranked games should go in sandbox, which will boost the ever slowing population of 12 person closed setups, and ranked games should go in main lobby.
Without the influx of unranked games being made, competitive games will not be second paged so fast, and thus fill more often, allowing more than 2 setups to be played each round.
The user base is decreasing without many fresh users joining and staying.
Removing unranked games won't magically increase the number of users who play comp games needed to fill more comp tables.
if only people used the open game filter
I kinda agree with this but new users/accounts have to play 4 unranked games to play ranked sandbox is a private lobby now. It might be confusing for new players that they need to go to sandbox to do this as well unless it autoloads them there or an unranked lobby.