Hi all,
Time to report my own experience. On my most recent trip, I travelled through LAX, TPE and BKK.
LAX- no issue with digital UC membership card
BKK- required physical UC membership card
TPE- 50% required physical UC membership card; 50% ok with digital UC membership card.
All the lounges that demanded the physical membership cards only wanted to see the “star alliance logo” on the physical card.