Apparently it was removed to reduce the load on the database see [0], [1].

The top voted response points out that SO are [2]:

> destroying a valuable feature for users.

Kinda wild they allowed it. As that answer also suggests, perhaps rather than remove it entirely, they could just compute those stats at a lesser frequency to reduce load.

[0] https://meta.stackexchange.com/q/399661/389220

[1] https://meta.stackoverflow.com/q/437862/5783745

[2] https://meta.stackexchange.com/a/400024/389220