1. Yes it's true that INR has depreciated vs $. But all of that depreciation has been coming in the zero interest regime we have been in the last decade. If you see the previous decade, INR was flat vs $ and NIFTY also grew more than S&P500. Point here is to say that there are financial cycles and the next cycle is likely going to be different (because of higher interest rates at least in the medium term) than the last one. Additionally, higher interest rates also makes US equities less attractive than what they were in the last decade, and India is likely to be among the fastest growing economies in the next decade so a good bet for diversification for 5-10% of your wealth.
2. Can you elaborate on tax laws becoming more onerous for NRIs? The Feb law change doesnt affect NRIs remitting money outside, so dont think is relevant in this case.