Seriously, I believe that the people making quality hi-fi equipment on a professional basis usually knows what they're doing, an that there's nothing I, an amateur, could do to improve their designs.
If a manufacturer recommend some fancy extras, I usually find they have some economical interest in selling those extras. Manufacturers that have no economical interests in the production and sales of fancy tweaks don't recommend them. And as I can't see why manufacturers of hi-fi equipment shouldn't want their products to sound their best, I can't interpret that in any other way than that the tweaks don't improve anything but the manufacturers' and resellers' income.
So, once I've found a kit I like and can afford, and it's connected with adequate cables (meaning nothing expensive), no tweaking should be needed on the technical side.
Unlike most equipment tweaks, optimizing the room has documented impact on the sound. But dependent of the room itself, such things are either relatively simple and definitely cheap, or almost impossible.
Positioning the speakers so the sound isn't bouncing off from nearby walls or furniture, and keeping subwoofers where they interfere as little as possible (usually meaning somewhere between your front/stereo speakers), will give you a tolerable result in most rooms.
All according to my 35 years of hi-fi experience, as well as several experts who doesn't earn money form selling tweaks.
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