What is the reasoning for Grin's high inflation rate? According to an interview with Yeastplume on What Bitcoin Did, Grin is going to have a flat reward schedule of 60 grin per block at one minute blocks. This translates to an annual inflation of 100% in the second year, 50% in the third year, 33% in the fourth year and so forth. 
For comparison, many countries target around 2% inflation, which Grin will only achieve in its 51st year of operation. Even given that actual inflation of fiat currencies may be higher, Grin's high inflation seems to make it unattractive to store value in Grin for many years to come.

Has the Grin team elaborated their reasoning for choosing a reward schedule with such a high inflation?
See this page of the wiki for a brief set of reasons:
https://github.com/mimblewimble/docs/wiki/Monetary-Policy