I do think the differing opinions on this are mainly divided among the "coming to ebikes from cycling" vs "coming to ebikes from cars". People who have cycled for a long time and get into ebikes already have start/stop/shifting technique down and the added power getting started feels amazing and a throttle completely unnecessary. People who move from motorcycles/cars don't and feel anxious when they can't accelerate quickly from a stop or like the ability to get things started even in suboptimal gears.
I think its entirely different from that... and much simpler (there are more reasons but what follows is the One Big One). The reason for the unbridgeable gulf in this tiresome, never-ending circular debate is because people ride fundamentally differently. People who ride for pleasure and recreation tend to ride in areas where the going is a lot easier in terms of distractions (paths, country roads... less or zero traffic and far fewer stoplights). Additionally their mindset is much more likely to be entirely focused on attaining the zen that comes from the cycling experience. This is far more likely to be a population consisting of analog cyclists who have at least dipped their toes in over to the Dark Side. But maybe they have not quite admitted that, or stopped feeling a little guilty about it. And as such they've dug their trenches and aren't coming out.
People who ride bikes for utility - commuters, shoppers and those who use them as automobile replacements - live in an almost entirely different world. Theirs is generally an urban environment. Riding on city streets alongside traffic in particular. They have places to go, things to do, missions to accomplish. All of which are utterly unrelated to the riding experience. The ride in fact is just a means to an end. For these people, practicality rules, and they are faced with a day to day reality that no amount of speechifying or preaching will change.
- I have a thing at 6:00 pm and I have to get back home from work fast. Pedaling is 20 mph. Throttling is 25 and I'm not sweaty. Throttle it is for tonight's ride home.
- I put in extra miles on the bank run and the grocery store detour. I put in my work for today lets take it easy on the last leg and ghost pedal on throttle.
- If I don't hit the throttle for a little more speed right now, that light I am coming up on is going red and I will have to stop for 3 minutes and piss away all that momentum I built up.
- If I go faster in rush hour when its crowded, closing rates with the cars are almost nothing since we are all going the same speed and more people actually seem to see me.
- 10 mph on the bike path with earbudded imbeciles and tree root bumps, or 25 mph on the bike lane in the street and I stay mindful of traffic. Every day I have to decide whether I its either 2 hrs traveling ... or 1:30. 25 it is.
- ... on and on and on
None of this is stuff a recreational cyclist encounters at any level of frequency. Certainly not multiple times per day as part of their normal, day to day slog. Its no wonder they think a throttle is ridiculous. And its no wonder the utility cyclists think the anti-throttlers are morons.
We simply live in different worlds.
If your bike works for a living, or its part of your relaxation regimen, you have a totally different school of thought on what cycling is. Until some tolerance around this is built up - and we cyclists are infamously arrogant about our opinions - this is going to go around and round. Forever.
p.s. a throttle 'getting things started in suboptimal gears' is not a real thing. Doing that is how you break your bike. Crack a small cog. Bend a chainring or snap the chain. The throttle is not the solution to bad gear shift habits... its the primary problem.