Hello,
normally, this feature is available in most other languages already, but it is disabled in English.
It is not disabled for any technical reasons, but rather because it was extremely difficult to moderate.
The English Playroom is a little special, in the sense that everybody who does not have Playroom in their native language comes to English by default. As a result, that main room chat was full of people speaking in their own language.
It's a little useless to have a chat where you can't understand half of the messages, especially if you are a newcomer who just installed and opened the Playroom...
This of course wasn't even the biggest issue. It is even more annoying when people start using famous words which are known to crash popular speech synthesizers such as Eloquence. Unlike on a free table where maybe you and a group of friends have a bit of fun with this sometimes, on the main room, this can't be allowed under any circumstances at all, because any player that opens the Playroom suddenly risks having their synthesizer crashed.
As a consequence, it would be necessary for a staff member to basically always be present and hand out bans/warnings in realtime.
There were a couple of attempts to re-enable the main room chat in English several years ago. None of them were really successful without causing many issues.
Now, what I am about to say below is purely my user opinion, and it doesn't represent the opinion of the helpers team in any way:
I personally think the concept of the main room chat is nice, but it isn't really that useful in practice. I have a bit of experience with this in other languages, and in many cases, people either write in the main room by mistake when they meant to send a private message, or they are writing in the main room to reach somebody who blocked them because they notice that the person is in the main room. The most useful part of that chat would probably be something like, "Hey people, anybody wants to play Jass?", but I don't think that usecase is so common. Too bad, because I would use it for that purpose myself...
The only time the main room chat is actually fun is when there is some kind of a special event. For example sometimes in French there are interesting conversations when a new game is about to come out or comes out, and in English, we had a small event for Christmas of 2022 when the main room chat was briefly enabled, that also worked out quite well.
Such events can be considered from time to time, this probably requires the discussion of the entire team, and I'm certainly not going to make any decisions on my own, but it is probably the best compromise between no main room chat at all and main room chat always enabled.
Perhaps the entire community is more peaceful and there are less troublemakers than in 2016/17, and maybe spam isn't as big of an issue as it was back then, so it might be worth retrying that experiment.
Thanks for your question in any case, and hopefully you can understand the reasoning brought up here.