Today's operating systems and applications are unnecessarilyl complex Frankenstein monsters that the average person is helpless before when anything goes wrong, which is quite often.

My wife conducts online sessions at home, through a VPN, and it seems like every day I have to diagnose a problem for her whilie her patients wait. Sometimes it pertains to a device not having permission, sometimes the handoff between the VPN and local env requires a reboot ("Bye patient! - I'll be right back!") Sometimes a window is on the wrong monitor and won't move, sometimes the microphone won't activate, other times the camera.

Why is there not a dashboard on the destop that controls all these things in one place?

Why is a reboot ever needed? Why are so many things in the OS kernel?

Why does today's Web browser require a thousand times more memory than a browser did in 2000, when it does essentially the same thing?

Unnecessary complexity.