In my view, the router table is not the place to make mortices.
Some mortices, open ended e.g., are of less risk but at some risk nonetheless.
The nature of using a stationary router for morticing assumes straight stock, square and flat. Moreover, the fence and table surface must be equally flat and defect free.
If your QC is <100%, you may feed a cork-screwed stick into the cutter at any time.
Now this is for open ended cuts. As the cut proceeds the work may self feed as it "finds" itself along the fence. Anything unexpected like that can put your hands in the proximity of the cutter spontaneously and eat you up. So you can have problems with 1/2-blind mortices.
Now whence cutting a blind mortice your risk has doubled. You can't see the cutter and in the event of a self feed the work is torn from your hands and the cutter has a field-day. Neither scenario is worth a minute in the ER. Better you concentrate on building fixtures
for hand routig mortices with a plunge router.