all very well - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
All right or quite true as far as it goes. For example, It's all very well for Jane to drop out, but how will we find enough women to make up a team? This idiom, first recorded in 1853, generally precedes a question beginning with “but,” as in the example. Also see well and good.