‘‘Solo: A Star Wars Story’ Writer Reveals Why Tag and Bink Scene Was Cut’…
http://comicbook.com/starwars/2018/05/26/solo-a-star-wars-story-deleted-scene-tag-and-bink/
(with direct quotes from Jonathan Kasdan)
I did want to see them, but would have been left wondering how they end up in the Rebellion. Based on their apparent age in the comics, they would have been a bit young to be in the Empire. This is complicated by the prequel comic where they were padawans enlisted by Anakin to convey messages to Padme and the worst students Yoda ever had.
They really should have been in the end of Rogue One though. 😉