I've seen some pretty hefty, make-up muck spreading when setting out a building on dodgy (out of level) foundations, so no, it is unlikely to fail. Especially as there is plenty of bearing. It is frowned upon by those naïve blokes who have letters after their name.
But those blokes might also ask, "well if the padstones are crap and are crap for everyone to see, what else are they doing crap, including what is not immediately easy to see?"
The less nieve know that it is rarely a single thing that makes a crap job, but the sum of several things. And the crucial thing is whether the OP is paying good job money for crap job results
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