Seriously, are they there for a reason or did a couple of guys in the 17th century just decide over sherry and smokes that it would be fun to complicate horary even more?
No, these things are ancient, like thousands of years.
As I like to say,
Strictures are Warnings to the Astrologer to take certain things into special Consideration when making judgment.
Lily is quoting Bonatti who wrote in the 12th Century.
Bonatti is quoting Zael, Masha-allah, al-Kindar, Omar, Abu Ma-shar, Abu Ali, Ibn Ezra and others who were writing in the 400s-700s CE.
And they're quoting Dorotheus, Rhetorius, Ptolomey and Valens from centuries earlier, and those are quoting from centuries before that.
So, this is not something that just popped up in the 17th Century.
Lily did make one minor change and that is he actually pinned Early/Late Ascendants at 3° and 27° respectively, but I still consider the first and last 5° to be Early/Late.
Other than that, they're all the same.
Ascendant Via Combusta there's no point in reading the chart because whatever answer you give is wrong. The situation will suddenly or drastically change and the chart will give no warning to that and you have no idea how/why the change will manifest itself.
Tail in the Ascendant is another. It doesn't matter what the chart says, it will work out negatively for the Querent. I've looked at more than 2 dozen of those and can't figure out how or why things turn out poorly, but they do.
With the exception of those two, you can still read charts with strictures, because the strictures don't render charts invalid, they just warn you to be careful in judging.
For Early Ascendants, things just aren't ready yet, or there are obstacles or things that have to happen first.
Late Ascendants, the chart is usually full of separating aspects or there are squares and oppositions, and the Querent knows the answer, but they ask out of frustration or desperation.
Same thing for Void of Course Moon. Reading the chart will tell you why nothing will happen, which is usually a lack of aspects or separating aspects.
Saturn in the 1st House, if there's good aspects, it will happen but with delays. Usually (but not always) Saturn represents something holding the Querent back and that is what causes the delay.
Saturn in the 7th House, either the Querent is hiding something from you, or you don't know enough. If I cast a medical Horary chart, I wouldn't be surprised to see Saturn in the 7th House because I don't know enough about medical things to render a good judgment so I would be better off letting someone else who is more knowledgeable read the chart to get a good answer.
If you search through the forum you'll see where these strictures work all the time.