I think your opinion on MacIntosh depends at least partly how "audiophile" you want to be...I own a pair of classic MC2100 amps and (for me) they are a big part of my 'end game' vintage system. I can understand, however, that someone who spends big time and money looking for "audiophile nirvana" with things like multi-thousand dollar speaker cables, cable risers, rewiring their home to provide a dedicated clean power source just for their audio system, etc. is most likely not going to consider MacIntosh an end game / true audiophile level manufacturer.
And, truth be told (or at least my opinion be told)... there's also a little bit of snobbery that colors some people's motives. MacIntosh is one of the more commonly known higher end brands - if you don't own any Mac equipment yourself, you probably know someone who does... or at the very least you have some familiarity with the brand (similar to how anybody into cars at all at least knows that Ferrari is a higher end car company, even if they themselves don't own one). And a key facet of the audiophile nomenclature is the exclusivity of owning that more obscure (and expensive) piece of equipment that others may have heard about - but likely do not own; and may never have actually even seen (or heard) in person before. "Bragging rights and exclusivity", if you will...