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I don’t think the Ukrainians would mind let alone be threathened by Russians retreating too swiftly and efficiently.
I think it's important that we don't commit the same folly that the Russians did when they invaded, forcing the facts to fit their narrative and refusing to believe their opponents could learn and change accordingly.  
As example, the Russians managed to retreat from Kherson across a major river quietly and competently.  They still have a pro core of troops, plenty of equipment, and lots and lots of artillery.
So while sending 100 western tanks and 50 Bradleys is great and all, Ukraine is a big place and those numbers need to go up by a LOT.  The US has 2,000 Bradleys sitting in deep reserve just waiting to be decommissioned, I'd like to see us donate 500-1000 of them.  THAT would be a game changer.