Entity? It's a bunch of scripts, it cannot think nor perceive and therefore calling it an "entity" is a bit of a stretch.
Well, that's what
all AI is. Good AI is just code which happens to be very efficient and good at what it does. Doesn't mean it has to be complicated. So, multiple ships acting as a group, yes, should effectively be acting as one in a miniature swarm. It also means they should be co-ordinating a lot better than a group of human pilots would be, because there's no lag in co-ordinating tactics.
I find these appeals on difficulty of game AI to be ludicrous, to put it mildly. And all I see are fringe examples, of players so bad or new at the game that a script can beat them, or of these mythical super NPCs that can compare with ace players. Even if there were such NPCs, by the lack of whining and crying on the forums I'd say they're exceedingly rare.
Well, again, good for you, but I use the example of my friend, yet again. He's a good pilot - even played every single version of '
Elite', back when they first got released. Yet, the game
repeatedly hurls decent and very aggressive 'Dangerous' AI at him. That's not a "fringe example". It's happening a
lot. You can be a really great pilot, but if you're stuck in a Sidewinder/Hauler and you're suddenly set upon by a particularly aggressive NPC which has good armament, it won't count for much. Especially if they're in a Viper/Cobra - or even worse, something like a Python, Vulture, etcetera. Waiting for your FSD to spool up is great, but if your shields are getting shredded in just a few seconds, that tin-foil row-boat you're trying to cruise the stars with isn't going to last very long.
And if you're set upon by an entire
group of them, it's going to be a good deal worse.
I'm in an Asp and I've upgraded it to a decent level, but I know that if that kept happening to me half as much as it somehow does to him, it would be very frustrating (and I had a worrying encounter with a lone NPC Viper, the other day, which forced me to run). Coming along and, to all intents and purposes, going, "Pah! You're just not very good! It's
sooo easy..." Well, respectfully, that can come across as a little patronising, because it's not true.
Again, if
you don't have trouble, that's great.

Right now, I'm not having much trouble, either. But categorising solo as easy and open as some kind of base standard? It's illusionary. I only
ever play in open and have only
ever been interdicted by NPCs. Therefore, my experience would be no different to if I had been in solo (and, yes, other human pilots are shown on my scanner; they're just not choosing to undertake piracy). I'm honestly not seeing any realistic data which proves solo players are having some kind of massive impact on open players. I've also seen a lot of You Tube footage of PVP and it really doesn't seem tremendously different to the high-ranking NPC opponents I've fought against, either (in a few cases, they're actually much worse).