Many of us watched in real time as NASA got signals from Perseverance sent during its landing maneuvers. However, what we actually watched was video from earth of NASA’s team responding to this news + supplemental videos that were recorded in advance, including a simulation of the landing procedure.
It takes quite a while to send data from Mars to Earth. We can’t easily send a multi-frequency or high-frequency signal. We use radio frequencies for a good bit of the data transfer, and radio frequencies carry very little information compared to, say, a household internet connection. The ubiquitous household internet connections in 2020, after all, allow real time video. But radio signals do not.