I have a 2018 with a little under 20 hours that is nearly never able to start in first gear (with clutch lever in, obviously), it requires a whole lot of effort to roll along the ground while in first, and while I can kick-start it in first, the bike jerks forward a little with the kick. This seems like an awful lot of clutch drag to me. I'm using the exact gear oil spec'ed in the manual, it's changed regularly, the gear oil is fresh, etc. This all happens while the bike is "warmed up" (though the riding I do is mostly low speed and in winter I doubt "warmed up" is very warm).
My starter died completely around 15 hours and I replaced it with OEM. The new starter worked about as well as the old starter did before it died, meaning it's still hopeless while in first, and, while in neutral, it starts fine when warm and ok when cold.
Seems like the problem is really the clutch drag, and a first-gear start is asking too much of the wimpy starter and battery. I don't really have a lot of clues about how to reduce clutch drag. Lighter gear oil?