Let's not kid ourselves by calling it gimmicks or overly complicated. It is the same hardware and methods for the Russian military. It also isn't security through obscurity. Everyone switched to software defined radios for their communication and radar for a reason.

There are methods to combat such jamming but Ukrainian forces don't have the training or capability. NATO can't just magicially make the Ukrainian military into one with the capabilities of military super powers like the US, China, or Russia. The US and Russia both have the capacity, infact the Russian military is extremely capable when it comes to the electronic warfare and countering electronic warfare because their military has to be on par capability wise with the US military.

Instead we have sad stories like what's left of the Ukrainian air force powering down all the electronics in their aircraft as they approach the front line because they have no way to detect and counter Russian electronic capabilities.