I am wondering about the importance of holding a "local" Star alliance membership with the Star alliance airline where you have your own country of residence (e.g. M&M when you live in Germany) as opposed to having any Star alliance membership?

For example, if you happen to relocate from Denmark to Germany, is it advisable to switch from SAS Eurobonus to M&M? Are the extra benefits big enough to make this shift or does it only add complexity over time? Of course, if you relocate once more in a few years (to a third location), then you will end up yet again in the same situation carrying multiple Star alliance membership cards with a dissolved miles status! The alternative would of course be to hold on to in this case either the Eurobonus or the M&M throughout future relocations (with the risk of building a miles status with an Star alliance airline not having its hub at your own location).

Thanks for any advice on this question, which must be a topic for many people frequently relocating in- or outside Europe.