While you may not be able to fully enjoy the property if you are not staying there, you can still enjoy your property in JB during the times you do go there, and perhaps even look forward to it. And while commuting across the Causeway or 2nd Link is out of the question for you at present, things may still change which may make it more do-able in the near future.
I agree that SG condos are very expensive. They are simply out of reach for me. I can't even touch them. I got a friend who say that it is cheap to own an EC for $780K, but for a fraction (1/3 or less) I can buy a similar sized condo in JB, although one probably cannot expect the quality to be like most SG condos. And because it is in relatively accessible JB, compared to say buying a property in Vietnam or Penang or Australia or London, it becomes an attractive proposition for many who find themselves priced out of the SG market. So for me at least, I am more grateful than proud to be able to own a condo in JB, something with my name on it.
I suppose the Medini perks (trade off with being leasehold) are meant to entice investors, with apparently low entry and exit options, though whether the ROI can be met is doubtful for now and near future. I believe people generally prefer freehold, but may not mind leasehold if that area is very desirable and has a lot going for it.