It's one thing if knowledgeable folks like those in Photrio use a somewhat questionable developing protocol with their eyes open, knowing the possible drawbacks. What worries me is beginners blindly doing it. They hear about ways they can purportedly save boatloads of money on developer, and then go overboard. They may use an inadequate amount of developer in the first place. Then they hear they can save money by diluting the developer but not increasing the volume of the working solution. Then they hear that they can reuse developer and start reusing the stock solution a bunch of times. If anything a beginner needs, it is consistency and the reduction of the variables to deal with in development. If reuse requires changing the developing time, I think that is an unjustified complication for a beginner. On other forums when people suggest ways to pinch pennies on developer, I never hear, a "Yes, but", I never hear them say what could be the drawbacks of doing one of those techniques, much less several combined.