guarantees that the only way to preserve personal wealth

This is a flaw in any paper monetary system with inflation.

Under a gold standard, you can hold physical gold, opt out of the financial system, and preserve your purchasing power.

With paper money, you're forced to invest, which lets the financial industry fleece you. Holding paper money in a checking account or under your mattress? You'll get ripped off by inflation. The stock market? Plenty of ways to get robbed there. Real estate? Again, lots of ways to lose a fortune if you aren't careful.

Even investing in gold is hard. The transaction costs on bullion can be 10% or more. There's a database of all gold purchasers. There are rumors of criminals showing up to gold hoarder's houses, knowing exactly how much was in their stash. Are you really going to say no to a criminal who's holding your family hostage? Keep your gold in a safe deposit box? You're not the only one with a key. If the contents of your box disappears, now it's your word against the bank's to try and recover. Paper gold like GLD? That's the same problem as with the stock market, you're getting fleeced.

An unelected central bank isn't "good". They're just lining the financial industry's pockets, with the cost paid by everyone else as inflation. Why is the financial industry so rich? That's because they get first drink at the firehose of free money the central bank is pumping into the economy.