They're as fragile as windows it genuinely feels like, give any light Flak gun on a enemy craft and you are completely without paddles in a few shots as the example picture proves. Increasing health and armor on them would be nice so they're at least surviving more than a few seconds into a chosen battle if your trying to make purely paddle vehicles.
A bonus wish but unserious one, having some size variants of paddles would be nice as well, due to the amount of singular blocks paddles compose it could reduce the block count a lot on those. as well as making them take up less of the vehicles "health" so having the paddle get destroyed is not leaving your ship suddenly a 65% health.