My old Kenda's were (I think) 30 tpi and my Vee8 are 120 tpi. They seem to get flats from road debris (screws, glass, etc...) about the same.
The Kenda were extremely stiff, noisy, rear tire wore out in under 1000 miles, had a higher rolling resistance; but, did a better job a lower double/single digit PSI. The Vee8 are very flexible, less weight, less rolling resistance for faster acceleration, had a higher top speed, and slight bump in battery range. The Vee8 had a lot of tq steer and lower PSI below 15 (keep them at 20-22 PSI).
I have a Transeo GT XL 700X40C commuter pedal bike I used before the rover (Mr. Tuffy+Stans). I NEVER got a flat in the 4 years I've owned this bike riding the exact same routes. I didn't even own a flat repair kit or tire tools until I purchased my Radrovers in 2016. I think it really comes down to the fat tire manufactures haven't put the tech into fat tires or tubes to resist flat like they have with thinner tires.
I've only seen 5-6 fat tire bikes in the last 5 years in a city and surround area of under 1 million folks.