I'm not arguing Monero doesn't have inflation, I'm saying it is different from fiat inflation and much more like mining precious metals like gold

(anyone can participate, it requires work, and is even more predictable so the market can take into account supply for their future decisions at any point in time - you can't do that with fiat inflation) and if people are voluntarily choosing to opt into Monero it isn't theft. No one forced anyone to buy Monero and it's up to the user to decide if they want to buy it after weighing pros and cons. If they didn't research enough beforehand to know that's their responsibility. That goes for anything.

What you say is true, Bitcoin doesn't have inflation, but supply alone doesn't determine value. Demand is also a factor and you can't control demand. Even something with more supply can be more valuable than something with less supply if more people are demanding it. Demand is constantly changing for any good/service/money.

The block reward is a constant, not a percent, so you can effectively treat it as zero over time similar to approaching a limit in calculus.