Genghis - can't agree with you more. Every RA / LY reg Yak that I know of was well maintained, often primarily by Russian engineers that were originally employed in Russia / USSR to work for DOSAAF on those aeroplanes & know them inside out and/or by one of the two main Yak dealers, who also know the aeroplanes inside out.
So anyone who suggests that the grounding process was a safety issue is talking out of their nether regions. Indeed I do not think that anyone in the CAA would claim that there was a safety issue involved.
Fact is, that once owners have spent a not inconsiderable sum in transferring their aeroplanes onto the G reg, maintenance will be undertaken in most cases by the same people / organisation as prior to that transfer...