I interpret the post to read, is Mac gear a stepping stone into High End audio, not Hi Fi. There is low end, mid fi and High end equipment out there, just as there is for computers, automobiles, watches, etc. In most cases, (note I wrote "most cases"), you get what you pay for. One article I read recently said it correctly. If you listen to the system and it totally disapears from the room and you are left with the artist, sound stage, depth, etc. then you are there. If I close my eyes and listen and can tell that I am listening to speakers, then something is wrong. I don't believe that audio reproduction will ever get there 100%, due to the audio recording chain and playback/reproduction chain. There are just too may items that can add distortion, or negatively impact the recording or reproduction. Such as cables, connectors, speakers, amps, pre-amps, etc. All add their distortions and colorations to some degree. However, Mac Gear has lower level equipment and High end equipment based on design and price points and compromises that must be made to meet such design and price points and to compete with similar priced gear. All that said, in my opinion, there is some Mac Gear that is definitely High End quality. The rest may be low high end or mid high end and some may be upper high end.
I have auditioned many times over the years Mac Gear and combined with other wonderful equipment, it can sound great. But this depends on system interaction and which Mac equipment you are using. This is true for any equipment. But the test is to select a price point. Look in magazines and they should you what the manufacturers offer within specific price points. So, pick a price point for a piece of equipment and compare Mac Gear with similarly priced equipment from other Manufacturers. Then, you will see that within the price limitations, Mac Gear is okay. I am a firm believer in comparing apples to apples.
Enjoy.