The smashed LED filament lamp will still work, so onece the user see that, he will be tempted to leave it in use....
The halogens continue to operate as well, that is not assumed as safety issue. Plus then physically breaking anything usually exposes live wires...
With those filament ones it really does not make sense.
The transformer may be smaller, but then everything will operate way closer to the technology limits, with severe consequences on the efficiency and reliability. Plus the worse efficiency would mean higher losses, so higher temperature, so even worse reliability.
Problem is with those uncovered "corn" lamps, there the conductors are accessible without breaking anything.