The 'merit' is defined by and is driven by 'to each his/her own'.
Same manufacturer component stacks are far more common than comes across on the forum...since many who choose this path are not active posters.
Is there any merit to assembling a same stack system to achieve excellent performance?
I read lots on here regarding the importance of system/component matching as well as speaker synergy with amplification. Is it too simplistic to simply acquire same manufacturer electronic components (integrated/dac/turntable/phonostage) while spending more time on matching the desired speakers to the 'same stack' of gear?