In the absence of a GE, then letting these rights settle, and making keeping them a manifesto pledge would certainly help to isolate the more extreme parties
It's one thing to prime someone to bore on about NI rises being a "tax on jobs" (which should have been news to no one who has ever done a days work ....). It's another to get them to say "these new rights are a bit crap aren't they"..Especially if people actually see these rights working for themselves, their families and their colleagues.
There is a reason why the push for Reform is so insistent and - dare I say it - every so slightly hysterical. Because it will be harder and harder to maintain the longer Labour have to bring in changes they will be forced to reverse.