Most of these step-thru bikes have either a city bent, or short range touring bent, and have a compromised suspension because of the step-thru, and most importantly have a throttle. The TM-B does have switchable saddle framing, one of which has is made for offroad riding. There is also an option for a lower rise handlebar/steerer for MTB. I don't see why this bike couldn't handle fire roads and the things you mentioned. Marketing material shows shows riders hitting single track, but I doubt anything more than green or light-blue, but this can be taken with grain of salt as the TM-B (and most step-thrus) could be hardly be characterized as what we would consider an EMTB. The throttle is disabled in EMTB mode. But what the TM-B does have is 180NM of torque, with mostly dialed-in high-pivot anti-squat, so even at 80lbs it would easily beat any M1 Avinox bike off the line.