Why is a 'Clock' Used in Computers?

Question

To clarify, this is not a formal academic field of study for me. At around the timestamp of 11:10 in this video (https://youtu.be/I0-izyq6q5s?si=xQ6Ec2RvZuJm67tl), I find myself wondering why an additional 4-bit register, 'C', wasn't included to connect to the output of the algorithmic unit. This way, the output from register 'C' could then be used in the final calculation output, without affecting the calculation of the preceding 'ALU'.

Side note: I am not familiar with all the jargon in this field, so I apologise if I use some unconventional terms, though this video should provide sufficient context.

I understand that adding such a register could require more circuitry and thus, natural resources, potentially introducing some delay (from input to output). However, it seems that this delay would be minimal compared to the delay introduced by the oscillating clock. Furthermore, intuitively it seems that the clock would demand more power, thus, generating more heat, because the time the input is on for is increased. Yes, there would probably also be heat introduced by adding more circuitry, since I assume electricity doesn't flow through circuitry without some of it escaping, causing more of the battery's capacity to be used, but this would be negligible due to how quickly it would move comparatively.

This is kind of speculative on my part, as I don't fully grasp what humans understand about how computers work yet. This is because I'm only on part 2 of the series and I find that the presenter rushes through the fundamentals and makes the process overly (exclusively) abstract for the sake of simplification. The later would be okay if he demonstrated how these complex circuits connect to ground and power, how they actually look like and explained the workings of batteries, circuits and breadboards by simply disassembling them.

Edit: I found two videos that address what the fist does not (https://www.youtube.com/watch?v=6WReFkfrUIk & https://www.youtube.com/watch?v=5vRAACeebjI).

I say this because observing phenomena or the universe directly is why learning is possible, it is the purest form of learning. It helps us understand the foundations of theories, decode jargon and innovate by identifying flaws in existing theories. Of course theories can inspire practice, but theories can't exist without it in the first place.

• Growing6884: I wonder what the downvote was for. I feel providing a reason for downvoting should be mandatory, in this way the poster can respond, and the downvoter is discouraged from downvoting for biased reasons.
• Andrej Bauer: It's hard to tell what you're asking without watching random YouTube videos. Are you talking about the clock generator?
• Solomon Slow: Around 12:06, the narrator says, "during the flat parts of the clock signal we want to do nothing because...this allows time for even the slowest signals...to get wherever they are going and let everything settle into a stable state." If you build clockless sequential logic circuits, you have to contend with the fact that some signals take longer than others to "get wherever they are going." They tend to be more complicated than synchronous sequential circuits that do the same job.