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Correct, there's no need to alter the figures really. The difference in reading between them isn't different enough to bother doing it. The power2max reads highest, both are on the same crank arms, same bottom bracket and same rings. Then the stages, then the powertap, but that's always going to read lower than a crank based meter.
So take it that you're 2% inaccurate even if you were riding at threshold for an hour that's a difference of 14 watts across the range of that 2% that your power meter admits that it can be incorrect by. Then take into account that no one here is Sky, or anywhere near world tour and at best British 1st category riders that are riding while having a job or at uni or similar. You can manage your form and performance perfectly well from tss planning, and ctl/ atl management they are accurate enough for pretty much everyone.
Slack-
If you're happy with the Stages, and you're happy with whatever error factors you're getting that's fine. Some people are not prepared to add (more) doubt to their measurements.
If it's such a novelty item for us amateurs, why pay 80%+ of the price for power to get one with issues? Why bother at all? Powercal are cheaper or use TRIMP or some other HR estimation.
All my PMs have been bought second hand and most have been cheaper than a new Stages unit anyway so the value argument doesn't even hold in my case.
Basically, we are now in circular argument territory. I won't be uses Stages, other people can make their own minds up.
hippy
So you currently have four power meters? That must be a ball ache altering all their figures every time you upload to training peaks, or do you apply an error multiplier to each one to make sure your results from various rides are consistent? Or, I'd bet, you ignore the difference and get on with your life? In which case, of course Stages is fine. Carry on. Be happy.