I don't think anyone has stated you can't access the forum using a phone, the issue is that it's much more cumbersome than using a computer and a real keyboard. I learned to type as a teenager, and even at my advanced age, I can type far faster than most people could possibly enter text on the phone.
The issue was raised posting pictures, but that's a non-issue if you use freely available resources. I use DropBox on my phone and computer, I just share the photo with DropBox and it magically appears on my computer where I can post it in the message. I can also easily manipulate the graphic to crop, rotate, and fix exposure and color issues if necessary.
