Thank you, Peter, and Jeffrey. Yes, in that interview he does say, right before mentioning his love of the cello, that
"it was always assumed that I would be a guitarist, not necessarily the same as a musician..... I never thought otherwise"
where the passive "it was assumed" seems to mean "we assumed" but at the same time he does not really think of himself as a relevant part of that "we", he just goes along with this assumption ("I never thought otherwise"), an assumption that was sort of transmitted to him by association...
But all of this is rather subtle, whereas in my recollection (or my dreaming of a recollection) Williams is much more blunt in how he expresses his awareness that the "assumption" he would be a guitarist didn't really originate in him.
It is probably in some other interview. I hope.
But what he said here is already enough for a contrast. In the first couple of chapters of Segovia's autobiography it becomes very clear that nobody imposed or even tried to impose the guitar on him (the violin, yes, but he rejected the violin, along with his violin teacher). Instead, it was the guitar herself that imposed herself on him by sheer seduction. The sound when he listened to someone play at closer range, totally captured his entire being. He became hooked, and he soon understood he had been taken over by the instrument. Taken prisoner for life. And that there was no point in trying to resist this sweet captivity.
I is a very different start to a relationship. And I think the relative "aloofness" that many people detect sometimes in Williams playing (in comparison with guitarists like Bream or Segovia) has to do with this. Williams is a superb guitarist. Wise matchmaking by parents is known to be able to produce stable marriages, even happy ones, but of a generally much more sedate nature than matchmaking done by the future partners themselves at first sight. Something like that.
And if this is the case, those who simply went along with parental matchmaking, sometimes are bound to wonder what it would have been like to have been forcefully taken over directly by an instrument that demands nothing less than inconditional surrender.