I disagree that a flat case count is positive. That strategy is essentially a bet on others failing to contain the virus. If you assume 90% of infections go undetected, you're looking at 2+ years until you reach 60% of immune people (10M Swedes, ~4300 new cases per week), so the time frame is probably dictated by the availability of a vaccine which - I hope - should be available sooner.

If other countries do succeed in containing the virus, that means travel in and out of Sweden will have to be restricted in that time frame, and death rates will have been higher (and not just a deferral effect).

Since some countries apparently have been succeeding in containing the virus, I don't think that is a good bet to make.