Why?
One thing we know for certain: the laws of rugby are NOT written to legislative standards.
We also know that the laws as writtten are not always followed - hands in the ruck, straight throw into scrum.
I meant in the context of the 2018 rewrite , where they went carefully through the whole book with the deliberate purpose of making it all clearer (and did a good job)
There may be some accidental ambiguities (it's hard to avoid completely) BUT wherever a whole section were omitted , or a completely new section introduced it seems to me they aren't idiots and it must have been discussed and deliberate .
So I imagine they deliberately took the view that a one man cavalry charge makes no sense , so get rid of it, flankers never bind in the third row, so get rid of it, every bound on clump of ball carrier + team mate + oppo should make a maul, it doesn't matter precisely who is bound to who , etc etc .
All those changes seem to me to be deliberate and to improve the game. And so on ..