

A lot of good older games had gameplay explained through play, but it wasn’t as common as it is now for the reasons you stated. Other people had to catch on and then learn how to implement the better design.
And there are still plenty of games that do a terrible job of explaining how they work or have complex mechanics with no apparent way of conveying it to players.







Reviews that explain the positives and negatives are extremely useful.
I rarely see demos for games anymore.