Is the acceptance rate no longer shown in every question of a user?
Or is that a temporary SE system bug?
Does that mean that the acceptance rate doesn't matter any more?
The display of the accept rate was recently disabled after an extensive discussion with the explanation:
Starting with the next build accept rate will no longer be shown.
We're still keeping track of it on the backend for various things, but the negative behavior its display encourages outweighs its benefits.
I do not think that the attitude that accepting answers is encouraged has changed in any way, the accept rate is just a number that is no longer visible on the user cards.
The list of recent feature changes has more or less up to date information on changes to the software.