Change the title: this should be called showcase not a tutorial
@ 1m45 you state "…so right now I am not going to be doing a tutorial on this thing…." , nor do you.
A tutorial on using a diode matrix to control multiple switches from a single input would (indeed) be useful to many, but you should also not overclaim ( @ 0m10 "…control all the minecart track in your entire world…"). The sort of set-up showcased would work well for a switchyard (eg. a villager sorter), but extending it beyond render distance would be problematic…
As a stylistic note: your videos would be more watchable if you refrain from jiggling the mouse (particularly when you want to point at something); the effect is quite nauseating [in the literal sense].
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WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.