I agree that Nikon 1 series was completely -and undeservedly- ignored by the public. I have two 1V1s, two 1J1s, and one each of the 1V3, JJ3, 1J4, 1J5. I only skipped the 1V2, because nobody was selling one at an affordable price. I bought some models for as low as 30€, the 1J5 (fully boxed, plus two lenses) for 180€ was almost a steal.
The 1J5 has the same resolution (20,8MP, on a 2.7x smaller sensor) as the D5 and D6 (minus 20 pixels): 5568x3712 vs 5588x3712
The 1J4 has the same resolution as the 1V3 (18MP), and they have a pixel count that's intermediate between the Df/D4/D4s and D5/D6: 5232x3488 (vs 4928x3280)
The 1J3 has the same resolution as the 1V2, and the 1AW1 (14MP): 4608x3072
The 1J2 has the same resolution as the 1J1 and 1V1 (10MP): 3872x2592, same pixel count as the D40X, D60, D80, and D3000.
Many solutions that were developed in these little cameras were included in the Z series (e.g. articulating LCD, AF-P lens compatibility), some features (e.g. burst mode @60fps) are still unique to the Nikon 1s.
The 1V1/1J1 (from 2011) are already compatible with the AFP lenses, there were no AFP lenses back in 2011 AFAIK, but for sure they were developing them...
If they kept developing, starting from the V3, with a V4 and subsequent improved models, Nikon's full fledged mirrorless cameras would have come out at least two years earlier!
Ciao from Massimo