This deserves a little more careful consideration, Jack.
What's involved here are common stock shares. The full 100% of the class A preferential stock remains where it always was -- and this is not directly about "Steinway & Sons, pianos" in the first place, but about the holding company "Steinway Musical Instruments" which counts a host of prestigious and other brands in its portfolio -- and that preferential stock represents 80% of the total voting rights, so this transaction, even within that context, is what it is billed to be: a minority holding in the parent company, not a direct, board level influence on Steinway & Sons specifically, itself.
I regret the 1972 debacle just as much as you probably do, but without 'a lack of transparency' in this transaction obscuring things from our view -- and having made a point of reading half a dozen analysts' reports, prompted by your post, which all see this as a comparatively marginal event in the greater scheme of things for Steinway Corp, at least one barrier distant from the piano company, or rather its flagships that hold our affections -- I think the sackcloth, never mind the ashes, is perhaps rather premature.
Besides, even the most greedy and ruthless have a habit of not killing the goose that lays the golden eggs, either financially and/or prestige/reputation-wise, and where the model D is concerned, they know precisely which side their bread is buttered on, and that the profession will simply walk if anything remotely resembling opportunistic, profit-led 'tinkering' might even be considered for their flagship.
That generally concentrates their minds wonderfully -- and long may it continue to do so... :-)
My reading of the runes, fwiw... :-)
Warm regards,