Grunf,
The guy is talking about MEL/MMEL rectification intervals not OEM inspection criterion!
Personally I think that if a fault can be deferred for 10 days then another 10 probably wouldn't hurt!
The main reason for the addition of a rectification interval is so that the fault actually gets fixed!! The reluctance of airlines to spend money on maintenance is well known (some more than others) so imposing an MEL limit ensures that it is fixed! The MEL time interval is determined (in my airline) as A - (read the remark), B - (3 days), C - (10 days) or D - (120 days) the interval decided as a function of system redundancy, failure rates, increase in crew workload, etc.
My airline has what it has called a RIE (rectification interval extension) agreed with EASA that allows, in the event of a lack of parts or manpower, for the MEL rectification limit to be doubled. It is rarely used but does exist and in my opinion doesn't make the a/c less safe.