Price is just a small piece of the story. Demand and Supply are dynamic not static so price is always varying moment to moment. More useful to check who is holding the debt that funds the infra and by when its going to be repaid.

In many countries of the world today, prices can go to 0 as demand just tanks on holidays or rain/snow days or supply spikes due to sudden increase in wind, drop in gas, coals prices, rivers flood etc. Large grids can pull the cheapest energy available from really far away from point of consumption. So nothing special anymore about prices dropping.

People are still paying for all that infra build out which takes years or decades to recover. Factories cant start up and shutdown depeding on the sun and the wind. So lot of expensive infra is required to maintain base and critical loads. Trasmission infra is not cheap. Any major weather event can wreck towers all over the map. More battery storage also means battery manufacturing plants generating more emissions. And there is the Efficiency Paradox/Rebound Effect which says when the chimp troupe gets cheap energy it makes more, pollutes more, consumes more, discards more.

So nothing is really totally Free in complex dynamic systems. What is really funny about the "info age" is that the more info we get, about ever increasing complex systens, the more people want simple stories. People dont want hear how complex things are. Its like the guy who builds Jurassic Park doesnt want to hear it.

This strange info dynamic itself creates a cost which modern media/social media is still quite unconscious about because we are taught more info is good. The story goes the "expert" will show up and tell the Jurassic Park guy dont do it. But we know from history Jurassic Park guy will do whatever he feels like.

Am I missing something, negative electricity prices, overall are a bad thing aren’t they?

Someone has to pay for it. Normally prices would tend to zero, this suggests more grid storage would be handy.