We could take that a step further.
No gems. No tactics other than the starting three. No league city units. No tech. [I have gone too far already] No mission armaments.
I might be the only one who would agree to this but it sounds fun to me.
I will also explain how each of these might be a bad idea.
Gems: The game needs money. Look everywhere else on the forum if you need to know more about that argument.
Tactics: Everyone who has higher tactics, uses them. Without the higher ones everyone who has them would have to massively change how they play. At the same time the starting three are needed for gameplay, without infantry everything you do is a waste of time, without last minute scout drops you will be blind in battle, and you shouldn't have to walk an entire city away just to resupply basic supplies.
League city armaments: The one I am targeting the most is large transports. The introduction of these critically changed gameplay for all players, you can move around tanks and massive amounts more units in general. Nothing wrong with them but not being able to use these units would force players to focus on ground movement to just slow down gameplay in general. Thus forcing higher cooperation for long distance attacks.
Tech: This is hard earned by the players who have it. Every unit higher in tech will be stronger than a unit lower and gives a scaled affect when in masses of that troop. Removing it in a tourney would even up playing fields and also cause great outrage.
Mission armaments: Because why not. The point of them in the first place is to reward players for completing actions. Removing these is most likely a bad idea but it will force players to attack the resource zones with what little troops are still available to them in order to build more troops.
This is a very bad idea and I'm not going to get much support most likely but if it somehow is added I would for sure play it.