Particles take a bunch of FPS, so i think it would be good if we had disabling particles option for us, the low end gamers. ( ͡ᵔ ͜ʖ ͡ᵔ )
The game should run just fine on the minimum specs listed... You shouldn't be playing a game if you're under-specced...That's asking for issues one way or the other.
That's the same thing as telling him "spend more money on a better computer or deal with it". It shouldn't be too hard to have an option to disable all particles being rendered. Its not like he's asking cars to not have jbeams for increased performance. The game already removes lighting and shadows when its at lowest anyways.
How low specs do you need to have for particles to lag for you, that shouldn't make any noticable difference at all
Does it matter? there's no reason not to allow people to disable rendering of some features of the game. Specially for a game like beamng that is known for being intensive on the CPU.