I don't know how and if people really manage to run many tasks in parallel and also not check the output. Very recently I had two items that for a reasonably intelligent engineer wouldn't be very complex, but would take time to implement.

One of them was vibe-coding an Electron app for myself that was running a Llama server. Claude couldn't find out why it wasn't running on Windows while it worked fine on Linux and Mac. I obviously didn't check all its output but after several hours had a feeling that it was running in circles. Eventually we managed to cooperatively debug it after I gave it several hints but it wasted a a lot of time for a rather simple issue which was a challenge for me also because I didn't know well how the vibe-coded app worked.

The second one (can't go into details) was also something that's reasonably simple but I was finding awfully many bugs because unlike the first app, this one was for my job and I review everything. So we had to go back and forth for multiple hours.

How can someone just switch to another task while the current one requires constant handholding?