Not that 18,20,22lbs...makes a rip of difference.
Might not for you, and is less likely to make a difference in the tropical diving app small wings are aimed at, but.... the capacity concerns raised by an actual customer were not for the "18" but for the "35".
Would you want to go diving in a 30+ lbs buoyant drysuit in cold water with a wing of unknown capacity?
If quality products and exceptional customer service is enough for Brian then what’s that to you.
I consider accurate specs part of CS, you may not, your choice.