I think the discussion here is kind of misguided.
As for the argument at hand: permissions are toggles. Not all of them are useful for all situations.
I think what you are arguing against here is that the lever should not be used, and what is being argued for is that the lever should exist; which are related but not exactly the same.
Let's take examples: There is a permission for reading messages. Is it useful? Most of the time, no, but if moderation wants to make a private channel, it's very important. There also exist a setting to limit how far back users can read messages in a community they joined. Is it useful to limit this? Mostly no, but surely it can be used in some instances. Heck there even is a toggle for being able to send messages. Sounds silly, until you need a read-only channel.
Should all channels deny the ability to send and read messages? Obviously not, not even in most cases, not even in some cases. Only really exceptionally where and when it is needed.
If community admins decide to remove the ability for @everyone to write in most channels, that would probably be a bad idea, and the users, dissatisfied and rightfully so, would probably be upset and leave.
I think this discussed toggle is very much the same thing. It should not be used in most cases, and limits and aspect of chatting we have come to expect. Does it mean that it shouldn't exist? I don't think so.
As for safety and privacy concern, as well as claims of oppressive behaviour, I think they are exaggerated. Nothing in removing the ability to edit or delete your messages prevents you from clarifying your point of view in subsequent messages, or correcting mistakes in the same way. Very much the same as day-to-day social behaviour, be it mails, letters, talking or whatnot. Most means of communication do not allow for retroactively changing your words, and most of them do okay as means of communication regardless.
I personally don't think you need to be able to edit your messages to be understood.
Again, I think removing the ability to edit or delete your messages should be very rare and limited to very specific use-cases; much like many other permissions; but while I agree that this toggle should most often not be used is not, in my opinion, an argument for the toggle not to exist.
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Comment by @vkyfox
@everyoneto write in most channels, that would probably be a bad idea, and the users, dissatisfied and rightfully so, would probably be upset and leave. I think this discussed toggle is very much the same thing. It should not be used in most cases, and limits and aspect of chatting we have come to expect. Does it mean that it shouldn't exist? I don't think so. As for safety and privacy concern, as well as claims of oppressive behaviour, I think they are exaggerated. Nothing in removing the ability to edit or delete your messages prevents you from clarifying your point of view in subsequent messages, or correcting mistakes in the same way. Very much the same as day-to-day social behaviour, be it mails, letters, talking or whatnot. Most means of communication do not allow for retroactively changing your words, and most of them do okay as means of communication regardless. I personally don't think you need to be able to edit your messages to be understood. Again, I think removing the ability to edit or delete your messages should be very rare and limited to very specific use-cases; much like many other permissions; but while I agree that this toggle should most often not be used is not, in my opinion, an argument for the toggle not to exist.