Operating in an environment where there are plenty of alternatives (Europe) and in good weather & traffic conditions, getting 'low on arrival fuel' - and being aware of it early and diverting - strikes me as a commercial thing rather than a safety thing. You still land with plenty of fuel, just not at your destination.
Of course I've wondered how many of these sort of diversions it would take for the advice to change. There has to be a break even point between constant fuel diversions and tankering everywhere.