Now you can see return as TWR, MWR or ROI. Imagine having possibility of see return rate corrected by inflation rate - means anyway more real return.
Trick here is there is different inflation per each currency. Different periods have different official currency inflation. For me personally big picture would be enough - annually.
With variability of inflation over years, variability of stocks value and currency exchange rate changes having understanding of result is key. Adding impact of inflation would add even more clarity of picture. Especially for more diversify portfolios.