Personally, I don't mind if people do that. I've seen some very cool items come from that approach. But if one chooses to do that, be honest about what you are doing, why you are doing, it and don't knock the donor arts that you selected in order to build your own art; they made it possible for you to do so.Some people, a lot of people, maybe even most people, do not have all the pieces. But instead of seeking out more pieces of the puzzle, they instead grab pieces from another art and use those pieces to fill in the blank spaces. Do that too much, and you end up with a puzzle that looks completely different. Then when discussions such as these come up, you are looking at your puzzle, while I am looking at mine, and we each think we are looking at the same picture when in reality we are not.
And don't tell people who practice those donor arts, or arts that are contemporaries of your new art that your creation is superior to what they practice. Your creation is your creation, and may have tons of merit. Who knows? Your students may want to spread your codified art and open schools in order to do so. But antagonizing practitioners of the donor arts and that of your contemporaries shows immaturity and insecurity.