Nucleo-H743 out of stock

That, and frankly the ability to post a back order so you'll get the parts first when they come into stock. There have been plenty of boards I've posted orders against and waited 2-3 months to receive. If you don't have orders in you have to hope there will be free stock at some point. These STM32 parts are popular, it doesn't take long for thousands of boards to evaporate.

Seeing availability bubbles for H7 and F7-DISCO boards, tending to July-August deliveries. Stock arriving will go to those with back-orders pending, if you don't have orders in you're likely to miss delivery windows.

Hard to understand the execution issues here, the H7 isn't getting a lot of attention, this suggests new silicon is in the pipeline, including talk of a multi core H7 and one that supports DSI and SWV properly. ST being frustratingly opaque on issues publically. At the May 3rd Tech Tour the H7 barely got a mention, brief acknowledgement it existed in a slide at the graphics presentation, and had to probe for specifics.

Seeing delivery for passives pushing out to 50-60 weeks, component vendors seem to be having problems accelerating with the economy.

If you have a hot project, speak to your local sales representatives or FAE, they usually have a handful of boards to hand, but I've generally found Mouser/DigiKey can get my boards more quickly.