5 probably not but it's good to have especially for a dedicated add-on option that cost some money.
I can understand that rationale but hard to justify from a customer point of view unless it is a $20 add-on. May be it is.
I can see the need for people switching inputs like from music system, home cinema system, TV, maybe another DAC to compare with.
All of the above have gone to digital outputs now and have been for a while with at least TOSLINK. Home cinema systems have gone multi-channel (or a TOSLINK bitstreaming of 5.1 over 2 channels). This is why I don't understand why you would target the last of the holdouts still in analog for any of those functions. Phono is about the only analog requirement for equipment people are still buying.
Even Parasound made a colossal mistake with their P7 (analog inputs gone nuts!) and have discontinued it and are clearing it out at bargain basement prices.
I see the pre-amp chain hierarchy in increasing requirements as
DAC+Vol Control
DAC+Vol Control+ Source switch (2-3 analog, 2-3 digital)
DAC+Vol Control+ Source switch (2-3 analog, 2-3 digital) + Sub output with crossover
DAC+Vol Control+ Source switch (2-3 analog, 2-3 digital) + Sub output with crossover + HT Bypass
DAC+Vol Control+ Source switch (2-3 analog, 2-3 digital) + Sub output with crossover + HT Bypass + DSP RoomEQ
DAC+Vol Control+ Source switch (2-3 analog, 2-3 digital) + Sub output with crossover + HT Bypass + DSP RoomEQ + Streamers
The market is fragmented between the above combinations of needs to cater to just one or two.
The all-in-one boxes get restrictive and expensive as you go up that chain.
If you can figure out how to cater to those multiple needs with some partitioning of those functions in 2-3 boxes so they can be easily chained, then people could buy just what they need and add more as needed.
The obsession with good measurements is great but I am afraid that it is making many boutique shops ignore larger customer needs over a broader segment.