The use of a throttle definitely changes the way I ride mostly at low speeds. Getting on and starting up-hill, crawling through pedestrians, crawling through vegetation, grass, single track and over rough surfaces. Best of all it helps me extend the range significantly, just like a motor cut-out does. It does change the bike from Class-1 to Class 2 but I can literally remove it in 10 mins. if someone noticed and wanted to press the matter. The throttle is also fantastic when moving fast and wanting to maintain speed, take a 5 sec. breather... every 15 to 20 seconds.
I was riding with a Stromer chasing me and when I let him pull up alongside after about 10 minutes his 1st comment was, "MAN! You don't slow down at all on throttle!" He could ride at 30 mph in his top assist level but the throttle would only hold him at 27 mph. He had to pump constantly to stay at 30 and worse gain that 3 mph back after a rest. I was in level 3 of 9 and carrying front panniers, bar-bags, Fugoo XL, water, chair, and a battery twice the size of his.
I totally understand and agree about the low-end production ebikes, I don't think they are worth even the minimal money and try to steer people away from them. But I disagree with your choice of motors. I think mid-drives are a better set-up for ebikes. Especially anything that is going to have long legs, climb or pull/carry loads. How long does it take to change the back tire on the trail?