While on the opposite end of my favorite spectra of firearms, i do know of the kolibri, and also remember first time seeing it in some firearm almanack in the days before the interweb.
.177 is fine enough, can be made really sound / power friendly, and can also reach far for such a little thing, and yes if i was given the chance i would step up to .22 or even larger.
But that is not going to happen with my benovolent rulers, and here i am phrasing myself carefully as otherwise, well them be Putin crazy no matter the side of the political spectrum.