Well, you can't build much in the ~10 minutes of a typical youtube video.

So presumably by "one take" hahamrfunnyguy means he:

* Stopped recording driving to pick up materials, placing orders where there's a wait for parts to come in, and suchlike.

* Stopped recording things speculatively, just in case he decides to make a video later.

* Stopped worrying about 'narratives' and 'thumbnails' and 'the algorithm' when working.

* Stopped cleaning off his hands and fussing with camera settings to get the perfect shot of every step on every machine.

* Stopped trying to make point-of-view videos and keeping an eye on the camera screen, so he didn't need the tripod between him and the workpiece.

* Stopped retaking any time he messed something up or flubbed his lines or the audio came out bad.

* Stopped worrying about set dressing like having a picturesque, tidy background for every shot

Then the editing process is just editing several hours of video down to a few minutes and maybe recording a voiceover.

import the video from your device. cut out/speed up the boring parts. add a voice over or music or corrections to dialog. add intro screens, cut screens, transitions, titles. tweak the audio, censor curse words if required. insert images or screenshots you reference. insert labels/graphics. export it. re-export it because you screwed something up. upload to youtube. fill out their required forms. write description, timestamps, link cards, end cards. create affiliate links if that's what you're doing. follow up on social media. etc. etc. etc.

you're probably thinking of streaming, which involves less work, but you have to do it in real time with OBS or whatever. maybe you're talented and can do it yourself, but sometimes that involves a second person at the controls.

sure you can just upload a raw video straight from your device. but this is exceedingly rare, because you've grown accustomed to at least the basic round of editing - you likely don't even realize what edits have happened. raw video is incredibly boring. will anyone watch it? if not, then what are you even doing that for?

you should try both sometime, it's not quite as easy or fast as it sounds.

Editing is boring work because you have to go through hours of video and find the right fragments and stitch them together, then rewatch to see if the flow is right, etc.