Aighht... basically, that's kinda like, you know, REALLY bad... Tbh, it'd been way less damaging to your security posture if instead they went like :
"yeah... we're gonna have to go ahead and reconfigure your home to operate in passthrough mode. This is going to require techs onsite so we went ahead and deployed some generic subcontractors. What they have to do there is, well kinda counterintuitive. They will be using brute force techniques to uninstall and didpose of ALL of your doors. So.... there's a bunch of little wireless packet things, like the kind use for 5G, or the other 5G, flying around everywhere. They always bounce off things and they get lost a bunch. Now that home passthrough mode is enabled, the packets can just 'pass through' and get where they wanna be. Sometimes other things, like humans, or ocelots, 'pass through' too. How exciting! After all, at ATT no one gives a ** if all kinds of critters go through your crap whenever we 'fix' something. "
When your ISP screws up your router settings:
1) It's highly likely you won't be aware there's a major security problem with your network.
2) potential attackers include, but are not limited to, massive numbers of ill-intentioned, yet impossible to identify, individuals quckly become aware there's a major security problem with your network.
When your ISP performs a literal brute force attack on your domicile, leaving you completely doorless:
1) You KNOW, 100%, that there's a major security problem. Your doors are gone. No doors. The physical equivalent of a router in passthrough mode.
2) Potential attackers are within a relatively limited geographic area, with numerous ways to learn more. They've likely noticed that things in your home life have been a bit weird.