As far as crowds go, if you try, you can avoid them, even starting in the ‘prime’ thru hike season.
Heading out of Wrightood, only 350 or so miles into my 06 hike, smack in the middle of the ‘wave’, I left with a few other people a bit later than most others. We hiked together that first day, but the 2nd day out, I kicked it up a notch compared to them. Not enough to where I caught up with the crowd that left Wrightwood earlier in the same day as I did. I ended up camping solo for 3 nights on the way over to the Saufleys. I only saw one or two other people during the days. When I got to AD, it turns out I was 4 to 8 miles behind a big bunch of folks, and about the same in front of another group. The key to this bubble was just being slightly out of phase with what the bulk of other folks were doing.
I was in a similar bubble north of Sonora Pass until nearly Tahoe. Camped alone and saw, at most, one or two people a day, for several days. Turns out there was a couple of other thrus that were seeing me for a few days - they’d see me cresting the next ridge. I had no idea they were there (didn’t look back), even though they were only, at most, an hour or two behind me for several days.
Another option to avoid other people is to night hike, or hike only in the pre-dawn, hole up for the day just a bit off trail, then hike again, not long before sunset into the night for a while.
As fast as ‘touristy’ types - you’ll only see the masses on weekends near roads. On touristy things or towns - I’d say that there aren’t too many on the PCT. Mammoth, S. Lk Tahoe and Sisters are the only ones come to mind that might qualify as ‘tourist’ or resort type towns. And Mammoth qualifies, to me at least, as a REALLY cool town stop - it was quite hiker friendly to me. Ditto Sisters - a great town stop. Both can be avoided quite easily if you so choose.
As far as the Feb / early March start date: Ditto what Marcia said…
Token Civilian