This was in the past, when altcoins crash of failed, you will see that bitcoin is one way affect and dragged down by it but it doesn't happen like that again unless there some relationships like when BTC was used to pegged Terra classic protocol stablecoin, when it failed it dragged down bitcoin because the team sold the large junk of bitcoin under their reserve to buy the ust but the damage was beyond what they expected and that was how bitcoin was dragged down the last time and also FTX exchange but recently, I have seen multiple announcements of altcoin hack and theft and it doesn't seem to move bitcoin.

Bitcoin inflation is low, and the halving is making it more deflationary so I don't understand what you mean by high inflation and as for the excessive volatility, you can't change that because it's what make people make money from bitcoin, that's the only language investors understand and they will continue to play over it to make more profits and also losses.