What you are saying Who is John Galt? does not really sound right...
Sure you are correct that absent some kind of a breach or sloppily saving the keys, no one has access to the keys except for the person who has access to the keys, and so yeah someone can take their keys to the grave or take their keys with them when they get hit over the head and they no longer can remember which parts of the keys they need to put together or which devices (or services/or derivation paths) they were using in order to assemble each of the needed parts.
I am not going to call it control to lose your keys, unless you have done it on purpose, and most of the time, except maybe in Satoshi's case, would there be any kind of real justification to purposefully lose access to your keys.. unless you were purposefully wanting to donate your coins to the whole BTC community.. and sure some coiners may well be o.k. with that way of executing their inheritance to make BTC more scarce... ongoingly and ongoingly, since there are likely some folks who either intentionally or unintentionally have lost access to their coins.. and it is the unintentional ones who I have a problem in agreeing with you regarding their maintaining control of their coins, even though no one else is going to get their coins either.
That's right, the risks increase with the degree of control. And this is important to understand before you actively start using bitcoin. If only you control your money, then the full responsibility for your actions lies with you. Including losing keys, sending money to the wrong address, and other mistakes you can make. There are different ways to reduce risks. For example, use multisig, double-check the sending address, etc., but for this it is important to understand the level of your responsibility.
Losing against your will is unpleasant? Right. But it is better to understand that it is possible, and also to understand how it is possible, in order to make enough efforts to try to avoid risks.
When people say about bitcoin that it is trustless, it may not sound very pleasant: isn't bitcoin trustworthy? But it is important to understand that here both control and responsibility are on the user, and there is no third party that can or must be trusted.
In my opinion, it is better to know the truth and be prepared for the consequences than to be pleasantly mistaken.