When you are building up a high end system (....) you should ask yourself(....): What are the goals I'm striving for?Absolutely indispensable and the only reasonably approach to have, IME/IMO, etc. In fact, this should rule No1 !
What can I expect sonically from the component(s)OK, but the 1st question is the determining factor.
System synergy is not brand dependent. It has a weak relation with the costs of the individual components.Yessir!
It has also a weak relation with the technical design of the components (for example tube or solid state amplification, cone based or ribbon speakers).No, no. It has a lot to do with the tech side of things. The tech is one way of approaching the audio goal you set for yourself!
5: I would say the opposite holds true, esp. for digital front ends & many contemporary analogue ones. Not to belabour the point, this was successfully, and not altogether unjustly, touted by Linn in the '70s when their only product in the this industry was a front end (a record player) and many popular TTs weren't very good.