I very much agree with most points you're making. I'd however like to place a footnote here;
If you want to just send coins to a mixer site, cross your fingers, and hope that its not a honeypot logging the links between inputs and outputs, then I suggest that you click the links in my signature and try Chipmixer. Chipmixer is convenient, and it unlinks your transactions on the public blockchain. Javascript is not required.
If you want trustless privacy, that is a complicated subject beyond the scope of this topic. The best I can say here is that as Lightning grows, it will render all these questions obsolete for most use cases: Blockchain spies cant trace transactions that never touch the blockchain!
This is still a scenario which one -- who takes his privacy *extremely serious* -- should consider. We have yet to see any proof Chipmixer isn't a honeypot per se either (Though- it'd be pretty much impossible to prove or disprove anyway-). While I might believe that Chipmixer is acting in good faith- it'd be weird for me to tell others they actually are, without any immutable proof.
Therefore, if one is using Chipmixer for anything other than unlinking their inputs for the commonalty and some improved privacy, i'd highly suggest he thinks twice about such a scenario.
This is the biggest thing here, there's really no way to confirm this and even people that promote ChipMixer for money will say so. I wouldn't be surprised if the people at ChipMixer came out and said that too -- because it's true. We all put our blind trust and faith into ChipMixer without really knowing how much of it works, and how it's going to be helping us.
The real best way of mixing right now is using a privacy coin like Monero.
For the nothing to hide argument and all of that stuff, I point to Glenn Greenwald in one of his Ted Talks. Pretty much sums up my view, and can convince a good deal of people.
Over the last 16 months, as I've debated this issue around the world, every single time somebody has said to me, "I don't really worry about invasions of privacy because I don't have anything to hide." I always say the same thing to them. I get out a pen, I write down my email address. I say, "Here's my email address. What I want you to do when you get home is email me the passwords to all of your email accounts, not just the nice, respectable work one in your name, but all of them, because I want to be able to just troll through what it is you're doing online, read what I want to read and publish whatever I find interesting. After all, if you're not a bad person, if you're doing nothing wrong, you should have nothing to hide." Not a single person has taken me up on that offer.