Hopefully an F33A starting next week
You raise some good points, but it would still be nice being able to have performance data for a single engine piston without paying $300/year.
Again - You *will* have performance data... It'll tell you how long the flight will take, how much fuel you'll burn, etc.
To give you an idea of why you don't need the Performance plan for a normally aspirated piston single... I'll run through a couple of flights I've taken recently of different lengths, and see what the difference is. The ForeFlight Performance profiles are the ones that are built in, the By-Altitude profiles are the ones where you enter a ton of data yourself manually (and also requires the Performance subscription), and the Basic profile is the quick-entry one that's used in the Basic and Pro plans. IMO, the Performance one for my plane is a bit optimistic, but the only adjustment you can make is a slider with a ±20% adjustment for cruise speed and cruise fuel flow.
Short flight: KUES-C29 (57nm) at 6500 feet
ForeFlight Performance profile: 28 minutes, 8.1 gallons
ForeFlight By-Altitude profile: 30 minutes, 9.3 gallons
ForeFlight Basic profile: 29 minutes, 9.2 gallons
Short-Medium flight: KEFD-KJSO (135nm) at 6500 feet
ForeFlight Performance profile: 51 minutes, 12.8 gallons
ForeFlight By-Altitude profile: 53 minutes, 13.9 gallons
ForeFlight Basic profile: 53 minutes, 14.1 gallons
Medium flight: KUES-KCNB (363nm) at 9000 feet
ForeFlight Performance profile: 2:01, 31.3 gallons
ForeFlight By-Altitude profile: 2:31, 33.5 gallons
ForeFlight Basic profile: 2:29, 33.9 gallons
Long flight: KJSO - KUES (747nm) at 9000 feet
ForeFlight Performance profile: 3:43, 48.2 gallons
ForeFlight By-Altitude profile: 3:48, 48.7 gallons
ForeFlight Basic profile: 3:49, 50.2 gallons
If we accept the By-Altitude profile as reality (and I think it's pretty close - I'll have to test it next time) then the Basic is actually closer than Performance on my plane.