For example this smart plug is build on a esp32-c3 which supports WiFi and Bluetooth and can therfor work as a Bluetooth proxy beside being a smart plug.
One thing I don’t want to miss anymore (and that bugged with many ZigBee devices) are the local (on device) automations that are possible on a esphome node. To program a esphome node that switches a water valve/sprinkler for example to turn on off after x minutes when toggled on (no matter it is connected to ha/WiFi…) is something priceless. On the other hand a random ZigBee plug might not even allow to set a fixed power on state
That can always happen because airtime is not guaranteed. For ZigBee this is usually much more of a problem because of it’s low power design which has low penetration (range) and is prone to interference.
Personally I experienced the instability of ZigBee - on the other hand I have over 50 esphome connected to an over 10 year old consumer WiFi ap (which I got second or third hand) and never experienced any problems with that setup