In case someone finds this post in the future, I’ll share my observations during the last 10 days. Trig ships definitely patrol belts and attack people on sight. They will also destroy your drones, and probably target them first. This is a goodbye to augmented mining drones, unless you stare at the screen while mining, and I doubt many do that.
The group of Trig ships patrolling vary a lot, sometimes they consist of three ships, other times seven. Maybe more or less too. Their damage is not a problem for Orcas, it will take several minutes (often around 20) to actually destroy it, but you can’t ignore them. I can see them being pretty serious to new players in ventures and even players in the non-tank barges. Pretty sure a venture won’t even be able to warp out in time if it’s a bigger patrol, even if they aren’t afk. There are also a lot less people mining in my system (0.7 sec) than what I remember, but that may just be coincidental.
All in all, mining is definitely not what it used to, for better or worse. It’s not the biggest issue for people with the capacity to fly a mining Orca, except you need to get used to replace a few mining drones now and then, but it’s definitely another story for newer players and barges. It seems though that these observations only apply to asteroid belts. I did solo a few Emergent Conduit sites in my Orca and started mining the Talassonite afterwards. There are many disadvantages to these ores, the low value being the biggest, but it seems Trig ships don’t actually patrol here - only the regular weak rats (I may be wrong!).