Indeed however at this stage you'd expect the party to impose discipline harshly and nobody should be surprised that Starmer come down hard on any dissenters.
Any chaos at this stage is a bad look for the future but I suppose both Starmer and the problem children won't care too much about that. They're always going to remain a protest element and have very little drive on mainstream policy and it isn't like Starmer hasn't got the seats.
They'll remain loud but they'll exert about as much as Corbyn did in the Blair years.
When Boris Johnson dumped all those senior MPs over Brexit, it changed the rules. I don't think for the better, but all parties realised that most voters weren't going to complain, and it became an easy way to discipline people, and ultimately get them out of the party. In most cases, no worries about local democracy and trigger ballots - as soon as they do something wrong, the whip goes, and unless they get it back it's an easy way to prevent them restanding.
If it had been accepted practice during the 80s, I doubt Corbyn would have been anywhere near Parliament today.
I don't think it's a good idea, but then not only has it apparently become accepted by voters, but for many cases it's become expected, and seen as weak if it doesn't happen.
It's also interesting to note that the people who voted against Labour last night, were much quieter in the last couple of years, when they knew that this would likely have prevented them from standing again. At the start of a Parliament, they're no doubt emboldened, and I suspect that Labour realise they've not got quite the same power, hence sticking a time limit on the suspension. I also suspect that everyone involved is pretty happy with the outcome.