it is not overkill to airgap OT tech. having it on the internet is really braindead.

most ones that are routable are hackable real easily. the only reason no one does it is because they dont need to or dont want to.

more people should do this. there should be laws to prevent such systems to be connected to others.

main problem is often billing systems and sometimes OT stuff will need things like weather info or external data which makes it harder or more expensive to effectively airgap. remote places are also a pain to maintain if u cant connect into them.

this is why most of these places rely on not being routable over most internet, so u vpn to some place and connect in from there. Sibsequently many engineers will not properly secure OT because its not routable.

then a routing mistake happen at ISP and oops all the boxes are rooted -_-.

airgapping is not overkill.