I also don’t understand how this is a senton problem, air bos are pretty much identical regardless of map and the problem you’re describing would fit basically every other 20x20 replacement of sentons. Metir and no late game air bo? Immediate loss. Beetles and no late game air bo? Immediate loss. If air is bad, don’t make t3 mex and get shocked when game is over.
If you can't see this issue, then I think there's not much more to say for me and we will simply not agree on the matter. Which is fine too.