As far as the designers. I understand the Hype designer was quite offended that I removed the wingtips. The designers of the Capshie 50 and 140 changed the wing design of one of the planes wings and took the tips off.
I wouldn't say he was offended, just, well, if they wanna do that, let em do it.

the FF wing prototype i did on the Capiche, i asked about tips, but it was decided to leave them off, i assume for the same reasons you found, there was a 140 with a different tip section, but that didnt work well so it was changed back.
as for my Cougar i leave them as it cant KE anyway and offers some crash protection when things go wrong

thats why ones now green