These are actually valid arguments. Bitcoin is man-made and like anything that was made by men, it may or may not fail. I know it is ultimately based on math but look at the latest Ordinals/NFT stuff happened... the network was already crowded enough and NFT's made it even worse. What makes you think that the next update won't break bitcoin for good? We can't know that. No matter how many hours you test the software before the launch, there is still a chance that you will find a bug later on...
Every new update makes bitcoin more complicated and more prone to the new attack vectors. Segwit was cool but now the btc network is starting to look like a total mess.
Gold on the other hand has been running the same software (which is physics) since day 0. Never had an update because it never needed any. I think that's a big achievement over crypto.
If God had made Bitcoin, he would have made it so perfect that it wouldn't need any updates in the future...
This is one of the concerns, but I'd say it's one of the lesser concerns. Because even perfect code with no flaws would still have fundamental problems and tradeoffs like scalability or the limiations of the Internet. Paper money didn't fully replace gold or make it less valuable, gold just went from being a currency to store of value. Simiarly, Bitcoin will not replace gold fully, it will just be used as an alternative store of value.