That remains to be seen; if Sweden’s peers can prevent flare-ups, it looks like Sweden was wrong.
Arguments in favor of minimal restrictions include: avoid exhaustion of compliance in the population; avoid disrupting the economy, and negative effects on economy likely will affect population health; …
Or, well, they could still order it. But since it would have been illegal, it could not have been enforced in any way, as it would also be illegal to follow any order to enforce it.
Some politicians wanted a lockdown, but soon found out that Swedens crisis response laws are not triggered by disease, at least not unless it's a clear threat to the continuation of the state as such. Covid IS serious, but this far it doesn't look like a civilization ending disease.
Who knows how many times other countries will go in and out of lockdown in the coming years, and how long that will drag on. Melbourne just fully locked down again due to a rise in cases.
It's clear every country will eventually give up and go with Sweden's approach because they'll run out of "free" money, it's just a question of how long they will drag it out, or if a mass-produced vaccine can be effective and arrives in time.