People against addition of new civs, why?

New civs mean new content. Every time new civs have been introduced, the game has received new hype and new players have joined the community. Also more revenue

New civs bring more possibilities of fun and masta-pieces.

There are so many regions which haven't been covered. Some folks share really good ideas too. Surely some of those can be implemented.

As for "difficult to learn 35 civs", well 99.9% of us aren't getting anywhere close to competitive aoe anyway so that point doesn't really matter.