I'd consider Switch to be Gen 8.5, along with the PS4 Pro and XBX

Precedence? Yeah, during 4th gen, and plenty of them. Both of mid-term upgrades (32X, SupergraphX) and late starters (Philips CDi, 3DO, Pioneer LaserActive, Commodore CDTV). All those are considered 4th gen, but could be split up into two tiers due to this.