I know, and I may not understand myself in this case. Epiphany moment perhaps, and possibly the first time I will have ever bought something off a youtube ad. Just the fact that the battery snaps in and out so noone can take it is nice. Since lithium tech has gotten cheaper and better over time factors in too.
Honestly I never thought I'd invest in an EBike kit before, At least at one point I know the battery pack was super expensive, compared to the motor hub.
While my goal would be to use my bike normally whenever possible. I've found over the years the uncertainty of do I have the energy to go fast enough to make it in time often would force my decision.
This way if the tech can promise me 15 mph or whatever as long long as I'm spinning the pedals(including in broken chain situations) it would be a much easier choice.