Germany/Switzerland…Austria?

Cities:

Berlin 3 nights

Rothenburg ob der Tauber 1 night

Nuremberg 1 night

Munich 2 nights

Salzburg 1-2 nights

Fussen - Neuschwanstein Castle 1 night

Lucerne 3 nights

Interlaken 1 night

Should I skip Salzburg entirely?

Should I just do 3 nights in Lucerne and skip Interlaken?

I am definitely going to trim a few days/stops. This is the planning phase. Looking for advice. Non negotiables are Berlin(seeing friends), Munich, and Lucerne OR Interlaken. We’re a well traveled couple in our late 30s that have done 7-8 cities in this time frame without feeling rushed. We like to party but also like to enjoy hiking, architecture etc….We move fast but know how to slow down when needed.