This has been an issue for a while, now. I completely agree, it's awful. One of the Kiwi posters (sorry mate, whoever you are) said it was based on an algorhythm of crowd noise, which I always found hard to believe...but given how ****ty the highlights are, I guess it's plausible.
Clearly it's a cost-cutting exercise. Either the junior office boy does it, or it's some sort of automated process that spits out rubbish. To be fair, TVNZ (free to air broadcaster in NZ for cricket) actually do it OK. Or maybe I compare that to Spark Sport (online subscription model, had the cricket but shut down) who were absolutely abysmal.
The ones that **** me (as a former bowler) are that as you say, they skip through wickets, don't show enough of DRS decisions, don't show dropped catches, and for some reason show inconsequential singles and stuff around breaks, but not other key moments.
I dunno if anyone else can back me up, but I am a big golf fan. The PGA Tour (who pays billions in prize money across a season) has THE WORST highlights package of any sport I can think of. It used to be good...and now it absolutely sucks. It's all out of wack on time, doesn't build suspense with the right players, shows inconsequential shots/golfers etc, then sort of shoehorns the winner/challengers in at the end. So if an organisation with that sort of money and resources can't be bothered, I think we're all doomed.