I’m with ya 100% man.. It’s the nature of this hobby. I’ve been in it since the mid 1980’s, and we are ALWAYS gonna find those weak links, and build shiiiit better, given the opportunity..I stand corrected, I was just looking at different Arrma 6s hub adapters, aside from the FT, BR and new K6EXB, the others all have the thinner hexes.
Of course if the wheel we're using doesn't have a hex that's deep enough to take advantage of the hexes width, no gain. I see Tekno (MT410) hex adapters are chamfered at the edges as well, my guess is ease of wheel installation.
On a different note, Arrma does use small diameter pins to secure the adapters to the stub axles, which I have broken several of over the past 3 years. Tekno .3 models also used small pins, the 2.0 and 2.1 models now use larger pins, like any credible race level rig does, such as Xray. IMO as a basher, Arrma should be using larger diameter pins too.