Why it matters

Proportionately.

Signals

Readers use these details to judge care, and in some contexts, credibility. In a job application, a contract or published work, the cost of an error is out of proportion to its size.

In a chat message, nobody sensible cares.
Match the level of care to what the writing has to do.

Not a moral question

Language changes, and today's error is sometimes tomorrow's standard. Knowing the current expectation lets you meet it or break it deliberately, which is the actual goal.