Apple

You're barking up the wrong tree by asking how many displays the CPU supports. The CPU is not involved in displays at all.

It's the GPU that matters, and the M3 MacBook Pro is available with GPUs ranging from "barely good enough" to "holy fuck that's a lot of compute for a laptop".

The entry level GPU configuration can drive a single external display. The high end can have four external displays. The mid range can do two.

I agree, it was clearer in the old days when the CPU and GPU were separate line items on the order page... but if you go to the tech specs page and scroll down to "Display Support" for a full page of text explaining in perfectly clear language exactly what each configuration supports.

It's not as simple as just "what GPU" either — it also depends on the specs of your display (for example, is it HDMI or Thunderbolt? Does it run at 60Hz or faster? Is it 4K or higher? Those things matter and Apple doesn't even detail all of it, for example Display Stream Compression can free up a lot of bandwidth. If your display needs 64 Gigabits per second... such as this one then even at the high end you can only have one of them on Apple's most expensive laptop. I have no sympathy - that's a $300,000 display that doesn't even come with an actual display (you need to pay someone to build the wall for you and that might cost even more). Perhaps you should consider a Mac Studio instead? It can drive three of those projectors.

But back to reality, I do feel your pain. I've got two Macs on my desk, with Universal Control to share a single keyboard/mouse between them, because neither of my Macs can drive enough displays for the work I do. I can't wait to upgrade to a better GPU and go back to using a single computer. They are available now - but not as cheap as I'd like.