I'm baffled by the way some people think that because they don't need a feature (like SD slots or physical function keys) then nobody needs that feature and thus it should be expunged for everybody, let they suffer the appalling ignominy of having a computer with a slot or key that they don't use.
Personally, I like the sound of the touch bar (but I'm using an iMac at the mo', so it will have to wait until I upgrade to Catalina and can use an iDevice). However, I'm also aware that there are people who spend all day pounding a particular pro application and have memorised the function keys. They could have found room for both - especially as nobody was asking for the trackpad to be made even larger than the largest-in-the-business one in the pre-2016 MBP.
I'm not one of those pros. However, I've got a phone that takes SD cards. I've got 4 Raspberry Pis that take SD cards. I've got a Fire TV that takes SD cards. I've got a module in my Eurorack synth that takes SD cards. Other people have GoPros, dashcams etc. that take SD cards. You can get low profile fit-and-forget SD cards that are perfect for (say) storing a music or photo library on without wasting fast SSD.
Sure, there are adapters. Know what's better than needing an adapter? not needing an adapter! Know what the downside is of having a (tiny, cheap) SD card reader in your laptop that you don't use? None!
I don’t think anyone is saying “just because I don’t need it no one needs it”. We’re just challenging your “downside ... None!” statement. That statement is blatantly false.
There is a downside. It takes space. So do all the other “missing” ports. So do socketed RAM and SSD. So does a thicker keyboard. And all the other things people here are complaining about.
If Apple catered to ALL those things then this thing would either be twice the size and weight it is, or it would seriously compromise what cooling, battery life, and other specs.
Why on earth can’t you people understand that??
The thing is, in Apple’s target market, the things Apple has kept in are the things the vast majority of Apple’s target market want.
The things Apple has left out are the things that only a small minority want more than the other things.
But with TB3/USB-C, almost all of those things are still available externally, so those people are still catered to, even if slightly less conveniently.
The alternative to that slight loss of convenience for those relative few are compromises the rest of us don’t want.
Of course the other alternative is to just leave out macOS, and if you do that then there are countless other options available to you. Perhaps one of those would better suit your needs, especially since it seems the vast majority of your accessories are already alternatives to Apple.