Systems are groupings of components. With that come purely technical/electrical interactions and subjective/ flavour interactions. Like a recipe, the blend of ingredients affects the final flavour.
Many people want a ’warm’ sounding component somewhere due to the present sonic flavour of their system being threadbare, bleached, bright, harsh. In other words applying a sonic bandaid to an objectionable result. This can be just what the doctor ordered in that instance or perhaps adding another problem with trade-offs of its own.
The system works best and optimally when there is an even balance of virtues across the entire chain. Not one component doing the heavy lifting but all of them working well together electrically and sonically.
Exceptional source components tend to make life easier on the rest of the chain by bringing a full bag of virtues with little to nothing in the deficit column to the playing field. Many many systems are attempting to compensate for a relative lack of balance and capability at the source component. Even halfway decent amps and speakers benefit from a very strong source component.

