I think if your bothering remapping and rolling roading, putting afresh air filter in every year or 5,000 mile is worth while.
I use a k+n washable so probably just about braking even/into profit in cost after 7 years.
if I was to do over id just keep sticking in oe filters.
while im under there doing the oil, its only a bit longer to do the air filter(on the stilo)(but longer with a wash ,oil and dry).and I usually give the maf a blast (maf cleaner)also, as taking it off makes the air filter job easier
same with map sensor ,no reason not to clean annually.
I bet your mpg goes up a bit with fresh filter in.
Im sure manufacturers are stating 30,000 mile plus changes but is it worth it to leave them that long ?
same with fuel filters, im think mine is supposed to be 60,000km ?
no thanks I change every 2 years min prob 10,000miles.
I think this sort of service plus oil and filter is what id recommend before any sort of remap or rolling road work.