It's kind of weird that I can set off a bomb almost 300 meters away from it with a magical wireless detonation trigger. I get this is the future, but it also impacts balance in some weird ways. There's no risk to planting explosives against AI in particular, and even against players it means you could be in a very large area when you detonate explosives. I understand the need to have a safe distance, but if you aren't going to have to leave a wire trail, the range should be toned down somewhat so stealthily detonating explosives is a little riskier, making it more difficult to avoid detection after the explosion unless you set a timer.
And the AI is another big issue. With a mine that is buried and well disguised, it's understandable when a regular opfor soldier doesn't notice it. But when it's just a stack of C4 on a table, or on the floor, it should not only be noticed, but dealt with. Some sort of AI ability to call for the nearest engineer to come to deal with the problem would be awesome, especially if on failure, the AI would start evacuating the potential blast area. Instead, a soldier will just walk over and stand on a chunk of C4 like an idiot. Just plant some Cf4, have an opfor soldier run to that point with a waypoint, and see what happens. The AI is about as bad at spotting C4 in broad daylight as they are good at spotting you in the pitch black darkness of midnight.