Im not sure its fair to say that the Plastic Hydraulic hoses are a known flaw in the design... Those same hoses were used since the first Power Pole ever hit the market and has stretched 3 model generations. With each generation Power Pole has made multiple revisions to further better its product line. This can be said about most manufacturers who develop product that we all use every day. Maybe materials or resources that are available today were not back then. Probably a handful of reasons why they chose those lines.
I personally have never had a hose fail and have known many customers and friends who have not had one fail. I have also been in a boat when a hose has failed... It may be fair to say its a weak link out of a very solid design but to use the word flaw I feel is a bit of a stretch.
Always room to grow, Always room for refinement