The 6.5 on the FE I just bought is as small as I would be willing to go. Part of the problem is the move towards a taller/narrower aspect ratio. When watching videos in traditional 16:9 format a 6 inch screen is basically a 5-5.5 inch display.
I am quite looking fwd to a slightly smaller foot print. Having all 4 pixel XLs in the past I have started to appreciate the smaller size on my work iphone.
I used to travel with work and would prefer larger screen but that won't happen again for at least a year with covid so in the mean time this phone might stay in my short pockets