What is the problem with A>B>C redirects?

The problem with directing page A to B to C is that essentially you’re slowing crawlers down and giving users a poor experience by taking them through several pages to get to the proper information, the way to solve it would be to redirect page A directly to C (as well as B>C as before). If the link from A > B is one you have editorial control over you should also update it to point to C.