Maybe some day. Many ebike brands don't have XL frames, and a lot offer only one size 'fits all' which doesn't end up fitting very many. The interesting thing about my Yamaha buyers is a large percentage of them are rather tall, as in over 6'. You would think their frames would attract buyers that aren't so tall. go figure ?!? There is definitely a shortage of ebike frames designed for really tall riders though.
One size advantage of the Yamahas is they have very low stand over heights, and they do provide longer than average seat posts so you can raise the seats plenty high, and front cabling is long enough to add stem risers or adjustable stems that pivot up higher and toward the rider for a more upright position - but they are designed as moderate lean forward ebikes for aerodynamics. That is a much better position for back health, and your spine, than full upright. Your back muscles and core will support your spine better, and it handles road bumps better. I know a lot of people prefer upright posture so they can avoid wrist pain,but really that is due to a lack of physical fitness,and lack of keeping your body core strong as you age. The correct posture leaning forward provides better bike control, especially in turns, and will help you strengthen your core muscles over time, or at least help keep them from atrophying. Too many people lose all of that sitting all day in front of PC's or at desks.
It's a super nimble ebike that Yamaha is building and I believe as ebike industry and riders mature, and find out how much more they are riding, and the longer distances, they will refine their choice of ebike, and not purely accept the heavier weights of ebikes like Rad, and also also seek out better craftsmanship such as what Yamaha is providing. They are still priced a lot lower than many other competing mid drives that have similar component levels and at 43 lbs with the battery, and having only a 500 watt light weight battery and still being able to achieve 70 miles on level 1 assist, is a really nice combination to have. 3 year warranty on battery and motor is nice peace of mind as well.
My biggest wish for Yamaha is for them to start offering step thru models. The female buyers is a huge percent of my business, and with many older men wanting step thrus too, those step thru designs represent more than 60% of my sales. Its also interesting how among couples, it's more often the female making the first ebike purchase , and then later the male. It's like the male is all 'he-man' during the purchase process, and they think men don't 'need assist.'. Then when the 'better half' starts blowing his doors off on longer rides, the ego takes over, and 'capitulation' occurs. Lol. Single ebike only couples don't seem to last very long, and soon become two ebike riders having much more fun TOGETHER. Ebikes remain the 'great equalizer' between the sexes,as someone anonymous once said.