If you like to philosophise about this.. the game Eve had problems when too many players were in the same spot at the same time, and rendering everything in time.

Their solution? Time dilation..

Find your statement fascinating as well, but could also provide another haha-but-serious explanation that I personally like... which is that there are universes with an infinite permutation/computation/value of state variables, and our one could only be "simulated" within the one universe where these sort of limits exist.

  > Black hole event horizons are the maximum entropy per unit surface area.

This is an utterly fascinating way to look at it, especially in the context of your definitions of C and the Plank length.

I like to think of it as a limit imposed by the bandwidth limits between compute nodes.

A volume of computers connected in a grid with cables will have a bandwidth per unit area limit along all surfaces.

Similarly you can’t “know” about other matter in some direction away from you unless the information about it traverses the network links back towards you from there. Along a line that has a fixed upper limit. With more and more matter in some direction you get less and less information about it per unit of your time elapsing. It’s like watching a higher and higher resolution video with a fixed bandwidth — it has to play slower.

PS: hence the boundary of the visible universe is also an event horizon, it is the “depth” at which the total accumulated matter sums up to the same limit.

PS: The same line of thought works for the Anthropic principle as well! In the zoo of possible universes most have zero sentient life because the rules are not conducive to it. That’s the “core concept” but there is a nuanced version where many universes have just one species of sentient life. For example infinite travel speed would allow the first aggressive xenophobic and technically capable race to wipe out everyone else in short order. Hence, we’re more likely to be living in a universe with a speed limit where such “instant Borg assimilation” is physically impossible.

It only makes sense until you realize that flow of time is literally the first thing any simulation does simulate.