While that may be true, my experiences from Motorola 68k times still make me shiver. 68k used just bottom 24 bits for an address. Later models used full 32 bits

While that may be true, my experiences from Motorola 68k times still make me shiver. 68k used just bottom 24 bits for an address. Later models used full 32 bits, breaking anything that used the top 8 bits for something else. The introduced incompatibility was that bad and hard to get rid of. So pardon me for feeling uneasy.