Maybe less limited than what a pilot can do for himself, though.
I don’t know enough about controllers, but wouldn’t they have access to satellite imagery? Plus they may have pireps and they can query other aircraft, too,can’t they? Or contact a tower at your destination?
I was recently reading about the Norwegian version of NTSB for aircraft incidents. Came across a fascinating incident from I think last year. A pilot that had just gotten his PPL and was very low time made a mistake in judgement at a small airport in Norway. It was bad weather, so he cancelled his plans to take a trip but figured that it was good enough that he could do a few rounds in the pattern, get some takeoff and landings.
He took off, and almost immediately found himself in IMC, as he turned he really couldn’t see the runway even at low patter altitude. He executed two different 180’s and quickly realized he was in trouble so he climbed above. Another factor was terrain, so he did make a good call that it was too dangerous to fly so low, and that meant he didn’t dare keep at pattern when he wasn’t sure exactly where he was. When he was on top he saw no holes, but decided to try a nearby airport he figured he could get to, that he was familiar with.
Though he was “dinged” later for bad judgment, and also apparently didn’t know how to use the nav equipment (which I don’t understand how that could be but maybe it was because of stress?) they praised him for contacting ATC at a large airport a good ways away. They moved him to a different freq, and then proceeded to work with him. It was socked in, he wasn’t totally sure how much fuel/time or else didn’t trust his own evaluation of it.
meanwhile they had him on radar, and made calls to different airports (ones that didn’t have TAF’s, smaller airports) and finally found one within range that was not socked in. They actually called the airport owner who travelled in to the airport to assist. All went well, he made the airport and landed without incident.
it was a pretty riveting and well written report. Again, they praised him for his decision to contact and ask for help, noting that if he had waited it could have been a disaster. Read an update he is now an accomplished pilot and learned a lot from that experience.
Also they had assistance, as you mention, from other aircraft (at some point I recall he couldn’t reach ATC, and a commercial airplane relayed his call, as well as a helicopter, and others flying gave reports on conditions where they happened to be in the vicinity.
It also was noted that if he had climbed out on takeoff more slowly, he might have been able to do the round and land. He climbed at (apparently) Vy and so by the time he reacted was already too far into IMC. They mention if he had climbed less steeply he might have been able to keep out of IMC.