I don't mind the cool down system in BfN as it means someone like me with thousands of consumables in GW2 can't just spam the best stuff while a newbie is stuck with small numbers of even basic ones and may have none of the rarer stuff, and that's not even including the legendary ones that Rux hasn't sold for a couple years now. My main issue with BfN's cool down for spawning AI is that there's so little variety in what you can summon, and of course the summonable TV Heads and Wildflowers that ruin the defensive summons at range which we've mentioned many times before.
While this is more about the bots/pots, it does extend to the mobile ones, and as I'm sure we've all seen in GW and GW2, the attackers will often spam nothing but the coffin/pirate barrel/outhouse zombies or vase/porcelain vase weeds which can get tedious to deal with. The timer system addresses this somewhat as it means the team has to allow others on their team to use the summon spots for the better stuff, but again, the lack of variety and those ranged focused AI mess the idea up. BfN often comes off like it wants to encourage teamwork, which I fully support, but then takes it away with some of the new abilities and design decisions.
They could keep a timer system for a new game, but they have to get rid of the TV Heads and Wildflowers (both from summons and from the game in general, it's rare I dislike something in PvZ, but these guys are just awful) and vastly increase the variety of stuff we can summon on both offense and defense.
