The problem with the "single kerf" method is that it assumes that all you ever do is cuts with the saw perpendicular to the table. Any bevel cuts will widen (and therefore damage) that kerf.
If you are concerned about such things, a simple workaround is to just turn the top over for that and turn it back after. If you never bevel the saw, the kerf will last a surprisingly long time.
There are other methods too. Cutting a wider shallow groove in the kerf area and inserting a replaceable sacrificial strip is also an alternative. Filling the groove with a 2-part autobody type filler is another option.
I don't cut into my table at all, but mine is not an actual MFT. I have a secondary side-table for cutting. It has as replaceable end, rather than just a strip. It is aligned with a few of Dominos and held in by some Zeta connectors.
I occasionally use the extra piece of sheet goods as a sacrificial surface too. This is usually when I am cutting to a pencil line, rather than with a fixed rail.