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I hear you on this. The 1/second emission forever took me a while to get used to. Not sure I ever did. The Grin argument was that predictability is the key. No one can suddenly go full printer press Keynesian stimulus and flood the supply. True, but that constant drip drip drip every second, forever, has its own effect. Not to mention the psychological effect. People know that "this is how it is and thus is how it will be". With bitcoin there's the psychological that every day we're tightening, it's becoming harder money constantly.
Grin actually had its first big war over this. As I recall, the first fork was one called BitGrin. To be honest, I liked it better in concept. It was exactly Grin but with bitcoins 21M and emission and block rewards. Just Bitcoin with Grin's Mimblewimble.
Of course, it turned out to be a rug though! The main dev (an anon) might have minted an extra 5 billion coins. As I recall he gave some explanation of something. Suddenly disappeared and that was that.
Lots of people were pretty intrigued with the interesting scriptless-scripts design. However, one of the main reasons people seemed to be dissuaded from adopting it was that Grin started with a constant block reward. Every block would get the same number of new coins forever. While that is a disinflationary schedule like Bitcoin’s the high monetary supply inflation was often criticized: 100% inflation in year 2, 50% inflation in year 3, 33% inflation in year 4, etc. It would only drop to 2% inflation in year 51.
Easy to say in hindsight, but I imagine that it could be a contender for a top coin these days, if it had had a supply schedule more similar to Doge coin that had a drastically accelerated halving schedule which put more of the supply into play early on and then hit a fixed tail emission. The tech itself was cool, and the no-premine stance was widely applauded.