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Detecting incoming asteroids, especially small ones, is really hard. The recent 1-meter meteor that exploded over Europe, was only the seventh instance of a successful detection.

https://www.telegraph.co.uk/science/2023/02/13/asteroid-expl...

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But it is the big ones, we are interested in, because they can do a lot of damage and not only fireworks.

Tunguska was a lot bigger than a metre across. Even the Chelyabinsk meteorite was a lot bigger, 18 m diameter, 9 000 tonne. So if we cn detect 1 m meteors I think we should be able to detect Tunguska scale objects.

We may notice some small things, but that doesn't mean that we've found all large things.

According to https://www.nasa.gov/planetarydefense/faq we only know about 40% of the rocks sized 140 meters+ that cross Earth's orbit. If one of the 60% we don't know about came at us from the direction of the Sun, our odds of seeing it before impact are fairly small.

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