The dissenting answer, which I think is worth having in the thread.
I type on stock switches on a board I built deliberately. Not because lubing does nothing — it does — but because the honest size of the difference, on a board you use rather than record, is smaller than the amount of discussion around it implies. It is a real improvement in the same category as a good desk mat: noticeable in a direct comparison, invisible within a week of normal use.
The reason the videos oversell it is structural rather than dishonest. A microphone thirty centimetres from a board in a quiet room hears differences your ears never encounter at typing distance in a room with other noise in it. And a side-by-side recording removes the one thing that actually governs your experience, which is that you adapt to whatever you type on in about three days.
If you enjoy the process, do it — that is a completely legitimate reason and most of the hobby runs on it. If you are doing it because you expect the board to feel like a different board afterwards, do the four-switch test above first, because the answer for a lot of modern switches is that they are already smooth out of the box in a way they were not five years ago.