Storytime.
We have a member in our bike club who had a pacemaker installed a few years ago. He used to race velodrome, so he was quite strong, it's just that his ticker has a speed limit now. He's 72 or something.
He's got a nice Domane+ SLR eBike, ($$$$) which he really likes. Rides with any speed of group, though has a hard time keeping up with the fast group on descents and sometimes flats, when they go over 28 mph. He takes long turns pulling into the wind, (so we can draft behind him) etc.
His wife is 69 and super-fit, rides road bikes. Still runs 5ks and wins her age group every year. Her typical pace over 20-30 miles is 18 mph, and for a century she averages 15-16. (I consider that pretty fast, considering the time spent slowing down for stops)
Last year, they decided to do the Ride Across Indian (RAIN) ride, which was 162 miles or so. His Domane+ was advertised as being able to go about 75 miles on a charge with the built-in battery. He bought the "Range Extender", which is an accessory small battery the size and shape of a bike bottle that gives an extra 50% or so. The bike defaults to use the Range Extender first, so he thought he'd use that, and have someone charge it in their minivan, which has a built-in inverter that could power the charger while he was running down the main battery. Something didn't work with that, so he had to do it in one charge or pedal unpowered. (banish the thought!) So he just metered his electric, only using it for climbs and into headwinds. It was still enough for him to keep up with his wife and he made the whole 162 miles with 5% left at the end.
When I bought my Yamaha Wabash RT gravel eBike, my vision was to have a long-distance eBike, but instead of focusing on having enough batteries for an inefficient bike, I thought to get an efficient bike (in terms of rolling resistance and aerodynamic) and one medium size battery.