Noise, smell, maintenance. Pretty well everything you already listed. You can take your current trucks out and use them when ever and where ever you want. With nitro/gas you wont have that luxury. The power delivery will be different aswell. With your electric trucks all the power is available instantly, With nitro you need to wind up the motor to get power. Im not sure about current nitros/gas but when I had a 3.3 swapped rustler I was always having to retune for temperature and humidity so I was never able to just walk out back and bash around. They both have a place, I've also been throwing around the idea of getting a 1/8th nitro truck lately just for something different