What’s astounding to me and others in this thread is your mindset, reflected in your choice of words. For you, you’d have to carry around an AC powered USB4 hub. For users like me, it’s merely you don’t want to use a USB type-a adapter.
You've placed emphasis on the wrong words mate.
Let me fix it for you:
have to carry around an AC powered USB4 hub....
Do you see the difference? I'm saying you could use any of these sorts of solutions:








Those give some combination of USB-A female, USB-A male, HDMI female, HDMI male, Ethernet, SD and MicroSD.
Now do you notice anything about them? None of them, not one, requires AC power. Three of them
can accept USB-PD via a downstream USB-C port, so you can plug a USB-C power source into the hub, and it will charge the laptop, but they don't require it. They're all able to run on bus power.
This is the
smallest USB4 hub I could find
that's actually available to buy well, let's say
will be available to buy, they manufacturer is out of stock:
Looks not that much bigger than the 7-in-1 Anker hub above right? That's not bad on its own.. Oh wait. But it needs AC power. Well AC power adapters can be pretty small right?
I couldn't find a picture of it on their site, so I had to screen grab it from their official unboxing. For comparison, I'll show two frames: the guy holding the hub, and the guy holding the AC adapter.

So not only does your "solution" mean that the "all day battery life" of a new MBP is pointless, because we'd need AC power to plug this hub into, we'd also need a sherpa to carry the ridiculously oversized AC adapter itself.
as far as “well then why aren’t you also championing HDMI” ports blah blah. You’re just picking a fight.
You've completely misunderstood my point. I'm not asking why you aren't "championing" some other single-use port. I'm trying to make you see how everyone has their own specific use-cases. Multiple TB3/TB4/USB4 ports can support any of those use-cases, via adapters, alt-mode cables, hubs and docks.
A HDMI or SD card slot can literally support no other use-cases than a HDMI display/tv or an SD card. As I've said many times, a USB type-A port is
slightly more flexible than those two, because there are adapters for lower-speed interfaces over regular USB3.x (e.g. ethernet, card readers, regular USB hubs, etc), but it still doesn't provide the flexibility of even a plain-jane USB3.x USB-C port, and it's nowhere near the flexibility of a TB3/USB4/TB4 port.
So you wanted USB type-a right? You don't have a use for SD slots, nor for HDMI. Well because those two ports, which you have no use for, are apparently being added back - you now have one less port that can adapt to become a USB type-A port.
That's the point I was trying to explain. It's physically impossible to add every single-use port that a person might want/need, and every USB-C TB3 port removed to facilitate adding another single-use port, is another lost option to use the connections you actually need.
I look forward to seeing how you will next misconstrue this point.
Apple’s driven the MacBook Air & Pros to be too alike. If the Air were left at being the thinnest, most svelte laptop in the line-up, with only USB-C ports, say, and the Pros were a bit more generous in their port offerings
Sure because that makes sense. Provide the fastest most flexible possible I/O available, on the entry-level computer. The pro-level computer? No **** it, "pro's use SD cards dontchaknow?". Also, how do you expect a two-port MacBook Air to be a suitable replacement for a 4-port MBP, if I'm telling you a 3-port MBP wouldn't be an adequate replacement?
The described schematics and the inferred I/O already make it pretty laughable as a "pro" computer meant to replace their current 16" MBP. If the CPU and GPU offering are still just M1s and the only distinguishing feature from the existing M1 laptops, is one extra USB-C or TB3 port and HDMI, it's going to be a spectacular failure.
It’s equally fascinating how “me-first, me-only” the world can be.
Agreed. Imagine being so self-absorbed, you demand that a laptop not be equipped with as many flexible, adaptable ports that can connect to anything as possible, but instead, they reduce those ports, and put in the specific ports you personally want to use.
Truly fascinating.
PS: that part about a sherpa is sarcasm, for those who are not able to discern that on their own.
Edit: holy crap, MR really can't deal with fixed-height variable-width images can it.