I’m sure this issue has been covered and maybe it’s too late in the game life to do anything to rectify it nor do the devs have the time but I also think it’s important to discuss these kinds of things.
A criticism I have of the card library for each civ is it relies too much on quantity instead of quality. Many cards are redundant or obsolete now. If each civ had like 50-65 cards to choose from I think it would help new players while still maintaining the essence of the deck system itself. Civs just have too many cards.
So many cards could be condensed by combining them with other cards. Some cards like Grenade Launcher should be a tech. Same with church cards. What is the point of including Advanced Mill/ Estate when Land Grab exists?
If you want to go all in on a livestock boom strategy with the British you need to send 4 upgrade cards just to take full advantage of it nevermind 7 cows and the infinite sheep+ livestock pen card. I don’t know about you folk but I lose interest real quick. This can be said for many strategies and mechanics that require heavy investment which can turn people off.
When DE first launched I was half expecting to see the overabundance of cards available to each civ issue solved. We all love cards but at the same time it can be overwhelming, and if I find it overwhelming after playing this game since 2005 I can only imagine how new players feel.
One of the many strengths that set AoE3 apart from other games in the RTS genre is the card system but I think it can be much better than it is.