I don't feel as strongly about quote posts as I did in 2018. Personally, I am not a fan, but there is clearly a lot of demand for it. We're considering it.
If we did do it we'd like to make it something you can opt out of, in a similar way to how we plan to allow disabling replies. It's not entirely trivial.
@Gargron Shouldn't notification by quote be opt-in rather than opt-out? I've once seen a screenshot by a victim who was bullied through a QT on Twitter by someone who the victim doesn't know. The first notification seemed to be enough to make a big damage to the victim.