Hello,
from alot of playing and watching some replays as well as reading alot in forums,
Feedback Cyclone Lock on buildings automatically
SIMILIAR TO THE ZERG (who has so much utility) the very Baneling has the option of
Enabling Building Attack or not (with a very good building attack that is)
The Cyclone should have this option too…
I understand it is off by default so that the ability is not “wasted” on buildings ( a tactic many players use to help their army)
But the player should choose to let the ability go off on buildings too… And by the way yes I know how to press the hotkey and do it myself 
A part from fairness, playability, and improving sc2’s luxury why is this important?
Well what about your units patrolling your base and one of them happens to be the cyclone (which cost supply by the way!) and the Zerg decides to put a Nydus into your face?
The cyclone won’t attack it! Unless you consider the autoattack an actual attack.
The Cyclone only auto locks on THREATS - some buildings belong to this: any Defensive Buildings like Cannons.
Another option for this very reason is a dedicated one:
Put Nydus to the List of defensive Buildings, that way it is automatically targeted by units as a THREAT-priority similiar to spine crawlers.
This is again fair, since Terran got a similiar nerf: scvs being considered a Threat when repairing!
So why not give an offensive building Nydus in your base the THREAT-attribute?