At the risk of sounding like a hater - why would you release a feature that breaks a commonly used UX feature and greatly hinder usability / accessibility?
For the new features:
- Lists
- Paragraph alignment
- Preserving formatting when editing original message
Feel free to search the forum for historical user complaints / requests related to the above.
And:
- Less cluttered, more streamlined "reply / enter new text / send".
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Re: gray is not even close to the next best thing
Gray is definitely less bright than pure white, or am I wrong?
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Now there are people, including yourself, who really must have black (and sometimes not just dark gray, but pure black), for various reasons (less than perfect eyesight, AMOLED screens, ...)
But these people are in the minority, so we enabled the new editor by default so that existing users would see the new stuff - and not only the 5% who'd go into settings to enable it (assuming we made it off by default).
And yet - we did add a way to turn the new editor off, it's fully supported (i.e. not a "try it and maybe it'll work"), and with it you can get that "light text on black background" again.