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Can you fly in a carbon dioxide atmosphere? Why do we need to send rover landers? Why don't we upgrade to quadcopter drones that can get around more? Perhaps with a base station?
It's density that matters, and Venus has a very dense atmosphere. If you go high enough it becomes Earthlike in some ways. Landers can get certain data that is impossible to obtain from afar. Same reason we land on Mars. I have no idea how you'd begin to make a rover for Venus. It would break down in hours or you'd need to invent computers that can operate at several hundred degrees.
High density is good for flight no? The thicker the density the easier it gets to use propellers?
Yes exactly which is why flight on Mars is kind of tricky and flight on Venus (ignore the acid) or Titan is a lot easier