Sitting around thinking about some of the differences of my experiences when comparing riding standard and "E" bikes I remembered one factor from riding the acoustic bike (the Brit's name for standard) was managing heart rate.
As we age, most should know how max heart rate declines. "Max" being where the heart is being stressed at a level that could shorten its operating lifespan, and ipso-facto, its owner's lifespan as well. Pushing things to the max on a regular basis is asking for trouble as we get older. Knowing this, for the past several years I've used my watch to monitor heart rate while I ride and this has happily led to developing a good feel for noticing when I was getting out of the yellow and into the red zone. It has become second-nature for me to feel when I was pushing too far, then verifying this on the watch. My SOP for managing this was to stop (often mid-climb) and wait a couple of minutes for the HR to come back into the yellow before moving on. An added advantage derived from this tactic is how I've become quite adept at resuming a climb from a standing start on the acoustic bike, rather than pushing it up the hill.
Because I do enjoy riding and want to continue to do so for as many years as possible, it seems like a good idea to not overwork the cardiovascular system. It is well out of warranty and this strategy is as close to an extended warranty that I've been able to find. Besides, the manufacturer never was all that good at responding to warranty claims anyway.
Fast-forward to pondering about the eMTB and how the realization struck me that while still using the feel I've developed to gauge whether I'm punching near the red zone, instead of stopping the ride I can just bump up the assist level a notch. Then, bump it back down as soon as I feel my heart rate is back into the yellow zone. Being able to keep the flow of a ride going without stopping to manage HR levels has been much more enjoyable. I am able to get the workout I desire, get more time and distance riding, and I'm enjoying riding in a way I haven't experienced in a decade or two.
The phone app (Specialized Mission Control) allows fine-tuning of the support levels, and I've been dialing them down as my fitness improves. This results in extending the range I can get from the battery as my muscles take on more of the load. I've found this to be a good thing as the miles of new trail we've added to Rocky Hill are getting to the point that two laps now use up most of the battery.
YMMV