>> Surely it would be better to find a set of interconnects that suit one's taste and use them consistently in one's system <<
What's the science behind this note?
All wires are not created equally. Of course there's nothing wrong with either of the scenarios your post suggests. Sometimes, for $$$ reasons alone, it is suggested a lesser notch down the cable ladder will suffice very well as a downstream link, say as for a pre to amp tie.
It's as much a philosophical avenue as an erstwhile one.
you ought to try both roads and see for yourself. For the record, I tend to agree with your line on source makers saying one type on there and elsewise elsewhere downstream. Of course if you pursue only one of the aforementioned trails, you'll never know.