Another reason why Dominion isn't popular, and ways to help

There's no knowledge about the mode readily available to players.

It's different, that is confusing initially, and bots doesn't do a very good job of teaching you whats happening.

If there were an Intro Co-op vs AI like there is for SR this might help, as well as better information when you hover over the mode in Game Mode Selection. Something telling people that items are different here, and its win condition is drastically different, and that they might want to check out Intro bots. The tips at the beginning of the game are really just enough to scratch the surface of the mode.

Builds in champions spotlights would be cool too, but showing video of how old this map looks side by side with new SR would probably raise awarness of how dated it is.