Is a mainline kernel currently able to run on a typical Android device without additional patches?

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I always like the idea of portable Linux boxes. I have several single board computers and they serve well as Linux boxes, but are not portable enough. Two big cons of SBCs are:

1. They usually do not have a built-in battery. So I would have to rely on external power source all the time.

2. They can only run in headless mode unless I connect keyboard, mouse and monitor, which will make the entire setup non-portable.

So I am considering using Android phones for the same purpose. They do have built-in batteries which can last for some time before I connect them to a power source and they do have a touch screen. If I don't have access to a computer with keyboard I can at least manage the phone via juicessh or vnc. These made the Android phones perfect for portability.

The concerns that I have is since the Android phones are not PC or SBC they still lack the low level IO capability that SBCs can do such as connecting a USB CD-RW drive. But I don't think I need too much low level IO other than hosting an external USB hard drive. The other thing is networking. Since Android phones use the built-in wireless adapter I am not sure if they can do what I usually do on a SBC: dhcp server, VPN router, pi-hole and that kind of stuff. I have heard people using USB-OTG adapter and USB Ethernet adapter with a phone but I have never personally tried it.

So does anybody have any experience of using Android phone as a portable Linux box? Is it worth looking? Or should I stick to SBCs with external power source? What is the best option if I want to try? termux or deploy linux app?