* Sweden decided early on that an evidence-based approach should be followed. Many policies that are implemented in other countries do not have a lot of evidence showing their effectiveness
* Policy is still primarily dictated by the experts at Folkhälsomyndigheten (where Anders Tegnell is from), and not by politicians. Most actions taken by the Swedish government has been pretexted by "as requested by FHM we have...". State epidemiologist Anders Tegnell is generally seen as "being in charge" of the actions taken, even though technically he has very little legal authority.
* Sweden has a very strong history of indepenent government bodies. In Sweden, there is specific legislation preventing government officials from intervening in specific cases if there is a government authority in charge of the issue. The legal term for this is "ministerstyre", "ministerial rule", and even if an action is not technically in violation of this legislation, it is often used if politicians try to intervene in cases without creating general legislation.
* Being a high-trust society some measures that have been implemented as strict laws in countries other than Sweden are instead communicated as recommendations with a very high compliance rate.