Still well ahead of their release schedule two years into Switch's lifecycle. If you just take original titles developed in house or by second parties, the release schedule for Switch actually appears to be comparable to the Wii U, except we were also getting shit for the 3DS at that point as well. One would think that with one console to support instead of two, the frequency of releases would increase. Granted, handheld releases generally require fewer resources than home console ones, but one would think the resources freed up would result in an appreciably greater number of releases per year for the Switch.
You miss the point. Nintendo could not support both a handheld and a home console adequately by the time of the 3DS and Wii U. One or the other was always experiencing a drought. Funny that you ignore the Wii U's first full year, though. I guess you didn't want the Switch's 2018 going up against this list:
Lego City Undercover
Game & Wario
Pikmin 3
New Super Luigi U
Wonderful 101
Wind Waker HD
Wii Party U
Mario and Sonic at Sochi (actually developed and published by Sega but I'll give it to you, you know, if you want it...)
Super Mario 3D World
Not an awful year for Wii U, though one that had very little to offer "core" gamers until Zelda and Mario came out at the end. Anyways, this is what it is competing with, the legendary "dud year" that only got saved by Smash and Pokemon in November. And bear in mind, Nintendo didn't actually cease first party 3DS development until the end of 2019:
Dragon Quest Builders
Bayonetta 1+2
Kirby Star Allies
Donkey Kong Country: Tropical Freeze
Hyrule Warriors: Definitive Edition
Sushi Striker: The Way of Sushido
Mario Tennis Aces
Captain Toad: Treasure Tracker
Octopath Traveler
Go Vacation
Xenoblade 2: Torna - the Golden Country
Super Mario Party
The World Ends With You: Final Remix
Pokemon: Let's Go, Pikachu and Eevee!
Super Smash Bros. Ultimate