Playback of piano notes is non-legato
Windows 7, GIT commit: 2902cf6
See #16887: Slur and phrase end notes should play at 90% length, beginning with comment #20.
Basically, it seems that instruments.xml has long defined the Piano instrument to play "normal" notes at 70% gate time, which is much shorter than how most pianists would normally play - the default touch on piano should be mostly legato. Luckily, instrument-specific gate time settings were always ignored through 1.3. However, it seems 2.0 now honors the instrument-specific gate time settings, with the result that piano scores created in 2.0 sound pretty bad unless you add explicit tenuto markings everywhere. I propose we run a representative sample of pianos through and listen, but I'm thinking a default gate time of around 95 makes more sense.