Why are there closeup videos of solar flares, but it’s too hot on Venus and Mercury to send rovers?
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Observation of solar flairs in from earth or satellites with earth like distance to the sun. The use telescopes and fingers to get the right amoound of magnification and lighter.
A solar filter you hca use to observe the sun with a normal camera is not expensive. https://www.amazon.com/solar-filters-cameras/s?k=solar+filters+for+cameras
The main exception to earth-like distance is https://en.wikipedia.org/wiki/Parker_Solar_Probe It has an advantage over any probe in an atmosphere or on a planetary surface, all heat is radiation from the sun that is in one direction from the probe. It the other direction is a cold space you can radiate heat to.
You can compare it to if you are close to a fire, a thin layer of reflective material can reflect away the radiation from the fire and you can cool down by radiating heat to what is colder behind you.
Compare that to a sauna or a summer day with warm air. It is all around you and if you try to insulate from it the difference is how fast you heat up. You need access to something cool too to keep from overheating.
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