The DM uses their mic more than anyone else and may even have multiple groups. While it can happen, i mostly see it with new DMs and usually it isn’t a big deal.
I do agree i see this more in players. It happens maybe every session but im usually quick to call a player on it if it’s something like their turn in combat. Or a player was trying to roleplay with someone else’s PC followed by a few seconds of silence.
It took me a long time to get the sekiro timings down but they are not “all over the place”. They are literally timed with when you would get hit and take damage.
Deflect (there is no parry) too soon and you won’t take damage but you’ll receive posture damage. Deflect on time and you get no damage and no posture damage. Deflect too late and you get damage and posture penalty.
What i liked about sekiro is that it taught me how to be a better DS player. In DS i never bothered to parry, but after being forced to learn the deflect mechanic i went back to DS and was able to do parry more consistently. That aside, the game had fun, challenging combat and the narrative was compelling.