Yeah it makes sense.
That was my point. I think the enclosure is just fine and it served a valuable purpose in its day. When this was introduced there were very few if any PCMCIA cards available for use in an A1200, and with the price of RAM and hard drives at the time, no one was very worried about PCMCIA cards causing memory location problems. It looks no better or worse than the countless other HD/RAM enclosures for other Amigas.
Knowing what we do today and having so many other expansion options available at low cost, at first it does appear impractical, but in the proper historical context, it makes/made perfect sense.