Hi! First of all I think cubecraft is doing the best they can for both of the networks. Both of the networks receive different updates and different new gamemodes.
Bedrock have so much features and latest game(such as capture the flag, eggwars mega, beta games and other), and also have experimental mode.
If I’m correct java has capture the flag too, it’s a featured gamemode, which means that it shows up every now and then. The beta gamemodes which Bedrock has, are featured games for Java. About egg wars mega I’m not sure if this will be a good gamemode for Java, since the player-base is much lower. This will lead into a long waiting time before the game starts, which isn’t good obviously.
Java has right now more gamemodes then Bedrock (including the featured games).
Also keep in mind that when cubecraft releases a new gamemode, a lot of work has gone into it. Most of the times it’s for one of the networks, since both have different codes. Bedrock has multiple platforms: pc, mobile, playstation, which makes it much harder to add new games then on Java.