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They do add value when searching...

For example, searching for power-supply + failure is different than searching for power-supply.

The former makes it easy to learn why power supplies fail and how they can be fixed, the latter just yields a lot of questions about power supplies while they are not all about failures.

They do add value when you see the question in a list...

It allows you to identify that the question is talking about a failure, the title doesn't always give that away.

Burning the tag takes this value away.

Splitting the tag yields too many new tags.

Also, you get long tag strings like power-supply power-supply-failure.