The notch gives us more real screen estate and is entirely invisible in everyday operation. It's an odd design decision, but memorable and ultimately functional.
What else? Firewire? Serial?

USB-A has been deprecated by the USB consortium in 2017 — that's almost five years ago!
P.S. Of course, I ultimately expect your opinion and would never seek to invalidate it. Just commenting on some things that grabbed my attention.
Hey, thanks for replying to my post. I certainly respect your opinion as well, but please allow me some further thoughts on the matter.
The industry is certainly pushing hard in favour of the USB type C connector, but the fact is that it is far from ubiquitous, even five years after its introduction, as you point out. On that note, one should be careful with the word "deprecated"; even though USB-C superseded all previous USB ports (type A/B, micro-USB, etc.), type A remain fully supported by the USB 3.x specification (needless to say that USB 4 is even less ubiquitous than type C). Therefore, it is not so much "deprecated" in the sense of "old and unsupported", but rater "manufacturers should favour this new and improved type C port". (Of course, it bears remembering that USB is famously backward compatible, which is a big part of its historical success.)
So, as of now, USB-C is kind of a mess, with universal adoption nary to be seen on the horizon. How many times have I been on the go and in need of plugging a colleague's USB key (try finding one with a type C port!) and realizing in horror that I left my adaptor at home... (And please don't get me going on the NEED for a hub to do any meaningful desktop work on my 2020 MPB.)
Long story short, I'm all in favour of USB-C and would use it preferably whenever possible, but the reality is that the type A is still simply too ubiquitous to be left aside completely, even today. Just one USB-A port, that's all that would be needed. Apple realized their mistake with HDMI and microSD, but they stopped short of what would have been optimal (one port, so close!).
As for the notch, I am at best ambivalent. I can imagine that under duress I might give it the benefit of the doubt. Probably. Time will tell.
Cheers