Well leaving holes for e.g. capacitors would mean doing this for various revs which is an issue. It would also make the card considerably larger, more expensive, and therefore less attractive.
Since all these old caps are dead anyway, our approach is to have these replaced when you put in the board. It does not take long, and there are smaller caps available, and you could still chose to solder it in "lying" on the board instead of having it stand. Since you are at it, why not exchange other caps, too?