Then again, you have to realize that your use-case is almost a rounding error. There just can’t be that people, as a percentage, that have that need and it makes sense (to me) to optimize for the largest pie slice and let dongles/accessories cover the gaps for everyone else.
>With the old devices a lightning to usb converter was needed
So it wasn't for free. You still had to get dongles.
Personally, I just need an audio interface to plug in a guitar, a headphones and speakers into my iPad. I need to buy something, but nothing that I wouldn't have had to buy with a PC either.
My desktop audio interface plugs right in an iPhone (USB-C to C), no hub or dongle needed, and provides audio in/out, 5-pins midi in/out, microphone preamp, etc.
If it comes to the flexibility of improvising a jam session with inexpensive gear, we are in a much better place today than 10 years ago when phones had headphone jacks. And I say that as someone who uses wired headphones extensively and carries a 3.5mm dongle everywhere.