May just be a casualty of trying to cram in more ads. Older shows are often slightly sped up, and suffer cuts, to fit ad loads that are higher than when they were first broadcast (and that episode might count as “older”, these days)
Those kinds of changes irritate me more than they probably should, and having changes like that for such an annoying reason as ads makes it even worse.
If you're watching a show, it should be the same show it was before. I want to see the historical record of how it was when it was broadcast originally.
Same thing when they change other things about the show, eg Dawson's Creek where they have now completely changed the music because of some licensing garbage. It's not the same show. I don't even watch Dawson's Creek but that annoys me.
Maybe overstating it but I feel that it's important for our shared cultural heritage.
Say someone recommends a show to you, then you watch it but you're actually watching what is essentially a different show...