Well, I brought out TFA Blackarachnia for comparison and it looks like her hands are of a much sturdier plastic than Arcee's.
Could it be that with TFA nearing the end of the road, they decided to just use a lower grade of plastic? And that might explain why TFA Cybertron Ratchet's design was so poorly executed.
I can't speak to Blackarachnia, I didn't buy that one, I have enough of the character from the Beast era. In what way is the plastic better? It's a different shaped hand and digits, so that will add strength to that design, keep in mind.
Darth Vader is becoming the Mickey Mouse of Star Wars.
Kylo Ren - came from Space Brooklyn, although he moved to Space Williamsburg before it was trendy.
The use of a lightsaber does not make one a Jedi, it is the ability to not use it.