@theoriginaldev , don't take what's been said personally. There is a big mix of basenji owners here, all with their opinions, advice, and experiences. If you've never owned a basenji, then you're in for a real treat. They are extremely unique which is one of the many reasons why the basenji community is so protective. There are so many people that buy or adopt them with no clue what they are getting in to. The fact that you're here asking questions says a lot, and I'm sure you and your pup will be just fine. I've been in this community for a little over a year since I rescued my B/mix; and I'll try and clarify their concerns.
In regards to breeders, the reason we ask is to prevent further spread of fanconi disease among basenji. There have been a few breeders out there that have had loads of unhealthy pups which puts the health of the breed in danger.
Reasons not to ship a pup by plane; If you've done your homework and found a reputable, and humane way to fly your pup that you trust to take care of you new family member, then by all means go for it. However, most get shipped like cargo with no AC, noise, and other hazards. My cousin lost her pup in the back of a plane, it was pretty gruesome as another item being shipped wasn't strapped properly and pinned it and it suffocated.
As for training, I think its a great idea to get/do training. However there is always the risk of your pup getting sick before being vaccinated.
And as for the age 8-12 months. If you've never owned a basenji then you'll pick up on their very unique personality pretty quick. They learn a lot of social cues from their mother and litter-mates in that 12 months. If they don't learn them, they need to learn them from you, and if you're not an experienced in training stubborn breeds you'll have a tough time.
Bottom line is, its not personal. This same advice is given out almost daily here. Mostly to people who have no clue what their doing or how to do it; they get in over their head and then we see a post about them wanted to get rid of the pup. I came here a little over a year ago with questions and got the whole talk too; really made me reconsider adopting, instead I just did more research, continued to talk to people here, and I'm happy to report I have a very healthy, happy, and well trained B/mix. All of us here really do wish you the best of luck! And please feel welcome to come back if you ever have questions OR ADVICE!, there really is a vast amount of knowledge here (If you can put up with the tone in which its provided) .. GL!