That's a pretty marginal change in the context of European labor practices. There is still an "obligation of peace" while a bargaining agreement is in place, for example. It will (initially at least) only affect sites where there is more than one union who are competing for the same category of members, which is not all that common.

> It will (initially at least) only affect sites where there is more than one union who are competing for the same category of members, which is not all that common.

It is abstractly a huge deal and practically a huge deal for Hamnen, SAC, Brandmännens Riksförbund and other alternative unions because it excludes all competition among unions and channels all reform through the internal political workings of those unions like LO/Kommunal. As the a laywer in Arbetaren explained (and others have explained elsewhere) previously, it allows for company (i.e. "yellow") unions which is a realistic problem now considering Amazon is involved.