I've had bad experiances trying this:
- Return experience is TERRIBLE. I'm not kidding, with Amazon you've got one click to a QR code and a UPS store dropoff. Some of these mfgs you are jumping hoops for a week plus! And then have to box, buy a label, often pay for shipping and more. IF you can even get in touch with someone.
- Shipping experience is TERRIBLE. How does FedEx stay in business? I'm serious - the express port of their name is a joke. Stuff will randomly get stuck in a warehouse for a week. I've had their call center tell me that for SURE it will be delivered x date (because the online tool shows that date) but the package is still out of state at 9PM. So they'd need to get it in state, then to distribution center and then to a truck to my house by midnight - surprise surprise that didn't happen.
- I've gotten used products from the mfg? Do they get amazon returns back and then try to ship direct with those? How does this work that the new product is under the amazon.com seller and the mfg has the USED?
- You get on more mailing lists going direct. ULINE and friends now ship me these huge catalogs following tiny tiny purchases. Catalogs are still a thing!
Yeah, Amazon has disadvantages (counterfeits, fake reviews, more expensive) but its advantages (insane shipping speed/cost, strong return policy) are nearly impossible for competitors to compete with. The manufacturer is not going to offer same day delivery and no-questions-asked returns.
It is also often more expensive than Amazon, which is I think is largely due to Anazon's anti-competetive, and possibly illegal "most favored nation" terms, but as a consumer it does discourage avoiding Amazon (which is why Amazon has those terms).
I recently bought a camping tent from Naturehike, a budget but respected Chinese brand. I ordered on their website and, long story short, my parcel got stuck at a warehouse for weeks, presumably lost. They said they can't refund me before they retrieve the tent and "inspect the package", as if I somehow went to a warehouse in a different country, found it there, and damaged it.
It took me well over a month of back and forth to get a refund, and only after I repeatedly threatened them with a chargeback. I ordered the exact same tent on Amazon and had it the next day. As a bonus, it was now discounted on Amazon but not on the manufacturer's website.
I only order from Amazon a handful of times a year when I can't find an item elsewhere, but manufacturers are really doing their best to push me towards it.