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, i.e. about one grin per second. 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. Inflation will only drop below 10% in the twelfth year. This appears to make Grin unattractive for holding.

Has the Grin team elaborated their reasoning for such a slow reward schedule?