The upper management were always bad, however having a very well functioning technical department glossed that over, while the very strong drivers delivered their part - Management then proceeded to driver most of the good drivers away, and annoy the team out of several very strong manufacturer hookups.
In short Frank Williams were never a good Manager.
We went from (lets start with him) Jones, to Rosberg Sr., to Mansell, to Piquet, to some years of mediocrity, to Mansell again, to Prost (!!!), to Senna (!!!!!!!), to sadly Hill having to pull his weight because of reasons outside of managements control. Then we proceeded with Villeneuve getting rightfully the preference over an ageing Hill, then we got again some years of meh, then Montoya before Rosberg Jr. and then.. it was done. The last good line up that was instated under Sir Frank was Barrichello and Maldonado. Two good drivers. But one at the end of his career and one crash prone. But good drivers none the less. Everything after was to survive before Claire got her hand on Massa and Bottas and that was it. No good line up after, till Sainz and Albon. But that already was not under Sir Franks management. So I dare to argue that despite Sir Frank cutting corners his way and the fact that he was an absolute bumhole to deal with, he managed all the mentioned before. So I cant say I agree.