I get your point, but would really recommend giving it a read with the context of the accompanying text:
In the spirit of clearing up the screen so you can see more of the game, we've also added a toggle that will allow you to completely hide the Chat Box, as well as its filters. If you want more space to see the messages, you can disable the filters, rather than the whole shebang, so that you have a little more space to see what's going on in chat.
We’ve also added an extra button below the Chat Filter that will open your keyboard for you – handily, it’ll also help prevent you randomly opening your keyboard when you’re trying to scroll through the chat!
Check out the entire blog too: https://secure.runescape.com/m=news/mobile-tli-rework?oldschool=1
I know it's a lot of changes at once, but it really does make mobile viable for proper gameplay rather than AFKing stuff as it's good for now.
Edit: This thread has a lot more eyes and replies than when I first posted, so I want to add more clarification.
The proposed TLI changes are not final. The community team will be reviewing feedback and sharing with the team.
As for intention behind changes: it was to increase utility and accessibility of different styles of gameplay. I myself do PvM on mobile, I don’t just AFK skill, but a consensus among many players (not those who do actively play on mobile!) is that it’s only very good for AFKing.
We’re not setting out to ruin anybody’s gameplay.