Like I said lack of proper commander panoramic thermal sight. If you are in a tank buttoned up you can't see much of anything.ISR is clearly one of the system lacking... situation awareness for a good part of the defence line in Ukraine is relying on some foot soldiers with a radio in a hole at the front calling reinforcement. It's not pretty at all.
And the lack of satellite assets means ISR from satellites, when it is available, won't be as up to date as what the US is providing to Ukraine.
The main difference here is the waste amount of "commercial" Western optical reconnaissance satellites. Russia has nothing like that. Thankfully for the Russians, the optical satellites are pretty much useless when there is heavy cloud cover and everything is covered with snow in winter. I have been looking at satellite pictures of Russia and Ukraine since late November. You can hardly spot anything. It is either covered in a blanket of white snow, which covers everything and creates massive glare, or there is heavy cloud cover which makes optical observation pointless.
There are also radar satellites, even commercial ones, these should also work with cloud cover. But the information you can get is a lot more limited. You can basically identify thermal sources or large objects.
The Russians do have combat lasers. Just not portable or cheap enough yet. I think the most success will be electronic warfare to counter drones and there are several such systems already in use.Another weapon system for Ukraine would be one that got rid of small UAV. Some kind of mini c-ram/laser with optical/IR search system against the background. Would have been one of the nicest thing to field but without the knowleges that evolved during the conflict, it would have been quite hard to design it.