We are about to embark on our first trip across Europe using rail rather than flying and am struggling a bit with this notion of seat reservations vs a booking. One specific question I would like guidance on from the community is this. I have a Eurail pass and have booked two first class tickets from Munich to Prague on November 23rd on RE357 aka ALX357. Trying to get a seat reservation has been frustrating. I have checked the CD Bahn.DE and Eurail sites and get various forms of “the train is temporarily unavailable for reservations”. Without a seat reservation am I guaranteed a seat but not a specific assignment or could we show up and not be able to board because it is fully booked. It never states fully booked so I’m trying to decide do I show up and hope I get a seat or do I give up and book another train. This is a direct train so it is far more convenient and the other options have 1 or more quite tight connections <10 minutes. Being new to this and having luggage for two of us I'm uncomfortable with very short connections. I would welcome any recommendations here? Show up and try my luck or give up and look for alternate routing?
Thanks in advance.