If it's a wooden floor, or wood underneath vinyl or tile, the leaking water could cause problems if not taken care of in a 'timely' manner. It's the water you don't see that's the problem. It could have been leaking for much longer than you have seen.
The movement of the toilet due to not being properly anchored would cause the wax seal to fail, whether it was the plumber or an accumulation of slight shifts.
Why didn't the plumber finish the job?
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