In The Coronation Why was Luke !8:21 not read out ?

Im guessing it doesn't quite fit into the celebratory mood of a Coronation event.
But the actual coronation of the individual is not about them having lots of wealth and privileges, etc, but of the religious significance of a person being Monarch. Some past Monarchs have been known to live very frugal lives, while being surrounding by the usual rich trappings of their stat. Those days of such piety in Monarchs must be very rare indeed, if today at all.
It is mostly all about symbolism and ancient practice going back well over a thousand years from across Europe.

That said, while I don't mind Charles having his coronation ceremony, I think stuff like the big concert they have planned at Windsor tomorrow, superfluous, and considering the times we all live in, quite unnecessary.
That is definitely one event they didn't need to go along with.

But we can bet the Establishment will be going full hog with all of this, flogging it as much as they can.
The tabloid Media, especially going totally over the top,
This will be kept up for days on end!