There already are. Check how many views this home video about removing flow restrictors from shower heads has: https://m.youtube.com/watch?v=Wa1OBA5H6zI https:/

There already are. Check how many views this home video about removing flow restrictors from shower heads has: https://m.youtube.com/watch?v=Wa1OBA5H6zI https://m.youtube.com/watch?v=Wa1OBA5H6zI Likewise, the limitations on electric bicycles made it so that no mass produced bike is really useful — but homemade ones are, thus reducing overall safety.