Please clarify some terminology for me:
It is not the ABSD itself that will cause a problem with mobility but the loan to value ratios on second, third, etc. properties.
Are we talking about the second purchase, and then third purchase, or are we talking about a second loan, and then a third loan, while still in possession of the previous properties?
If it's the former like I think you're implying, that is unfair. If it is the latter, different standards for additional loans past your first, that seems fair to me, and will help prevent a RE bubble burst like that suffered in the US and too many 'speculators' overly leveraged and saddled with half a dozen underwater loans.