Everyone is entitled to their opinion. Since you have no clue as to what my experience or skill level is you really have no right to decide what is appropriate. Do you think that someone else should decide for you and others? Sorry I do not think that will fly. Guess what Ford, Chevy, Mercedes, BMW, Honda, Nissan, and just about all the car manufacturers buy from different vendors. Most of them buy from multiple vendors. I am going to use an old adage here you have most likely have heard before. " You should never put your eggs all in one basket." If your source goes out of business then you are out of luck. So you better establish more than one relationship.
As far as being a Noob is concerned, what do you feel I am a Noob to? Bicycles? Wrong! Electric Motors? Wrong! Electronics? Wrong again! Recumbent Bicycles? Very Very Wrong! Purchasing? No did that for a multi-million dollar company! Business? Nope, own one of those now and have owned others in the past! So if you asked if I have ever built an E-Bike I would have to tell you no. Guess what! I have worked on the Electronics in several different kinds of Aircraft so I figure that combined with my bicycle mechanics, car mechanics, and electronics, I probably can handle it. In fact except for a faulty part that I was sent and the horrendous customer service experience that you are dragging from one part of this forum to the other; my my testing the water has gone flawlessly. I also have an excellent group of support people who have built several E-bikes and manufacturers in the bicycle industry that I can reach out to if I need help.
Please let me know if you have any other concerns.