I'm not sure how this applies to teamgames, but in 1v1, banshees are extremely popular in the current metagame. I've played quite a few 1v1s in the last 1-2 months(around 100 in the last month alone because it's such a fun gamemode) and banshees appear in a disproportionally large amount of games that go on long enough to inhabit tech switches. They are literally THE airswitch unit. Actually, they are overall THE techswitch unit. They are super mobile, have good DPS with decent HP(better HP/cost than brawlers), force your opponent into making AA and punish the lack of it much harder than any planeswitch. Add to that their semi-decent AA capabilities and you get a super generalist unit that is useful to have in almost every game(tiny maps are an exception).
I'm not saying that they are overpowered in the most straightforward sense. But I do feel like their strength is somewhat anti-fun. For me, one of the most enjoyable things about ZK is the plethora of viable strategies/playstyles. I used to play SC2 quite a bit(around 1.5K 1v1s), but eventually, it got stale and boring. The same builds every time, the same responses and the same responses to these responses. That's not really fun. And I feel like the banshee is currently promoting that kind of play.
What if, instead of the gunship factory and banshees being the go-to techswitch, we would have lots of relatively evenly attractive support factory/tech options. So that planes, tanks and spiders(both crabe and infi are pretty amazing as a techswitch in some circumstances) could see a lot more action in 1v1, even just as a second factory. Arguably planes are still ok, but they don't seem to work as well as banshees. Even if a good air player disagrees with me here, for the majority of the playerbase, banshees are more effective due to them being a lot easier to use.
In case somebody is wondering, I'm not looking for counters to the banshee. I know and use them regularily and they have served me well enough. The aim of this thread is to discuss the effect of the current state of banshees on the fun aspect of the 1v1 metagame.