You know, making a Transformers Legacy line is kind of a fine-line balance, isn't it? Modern toy engineering CAN improve on figures from G1 and early G2 (but that doesn't automatically mean that it does), but from Beast Wars onwards, the improvements generally tend to be less drastic, and often (again, not always) at the expense of play features or gimmicks.
If they only feature the figures that genuinely improve on the originals, the line becomes "nothing but Geewun". But, when they update characters from later lines, those figures invariably get compared to the originals, and sometimes not favorably. There are trade-offs that have to happen, and they won't make everyone happy. On the other hand, that those characters get new figures alongside the G1 updates is pretty cool, and helps the line celebrate the entirety of Transformers history.