So after a VERY long talk with a CS rep, who agreed with me 100%, this is the issue:
I JUST NOW took this screenshot from TEquipment's website. I know for a FACT that this part won't ship until April, at minimum. How do I know? This is one of the items I attempted to order.
Nowhere does it say 3rd party shipping, manufacturer shipped/stocked, anything about NOT IN STOCK for TEquipment to ship. There is LIVE INVENTORY mind you, supposedly, on their website.
When I shop at a website with live inventory, I expect an OOS or BACKORDERED or MANUFACTURER SHIPPED or something telling me that there is a chance that the order won't ship as I expect it will ship (as in right after I order it). There was no warning on checkout pages, nothing. Just take my money for the order, air shipment, that you are GTG. Then a day later, I get an email saying 'oh yeah, those items are backordered, we don't know for how long, we don't actually stock this stuff or keep in touch with the manufacturer about inventory, but thanks for the order. Hope you didn't need your shit right away that you paid air shipment for.' Geeee, thanks.
One of the items I had tried to order showed "1 left" and it wasn't apparently there. Inventory management issues, I can get it.
However...
For this issue of displaying NOTHING to the customer to have ANY idea that these items are or possibly are NOT available is just not acceptable this century, much less in 2021 when we are putting robots on other planets regularly. I'm not ordering out of a Sears catalogue (Please allow 6-8 weeks for delivery) from 1985.
If you are going to drop ship it from a vendor/manufacturer, and for whatever reason you can't/don't have live inventory tied in with them, a very simple note that the item is "shipped from manufacturer" is extremely easy to put on the product page.