making your transaction resemble coinjoin (which is not a good thing, especially for those looking to hide their identity from their friends without using mixing services)
Why is that a bad thing?
That's called "remixing", those 262 inputs and 294 outputs gained even more privacy by participating in multiple coinjoin transactions.
But, isn't remixing supposed to not merge inputs and outputs? If I am known to own 10 / 100 inputs of a coinjoin, and after the coinjoin, I use these coinjoined inputs for the next round, essentially merging the outputs into one, then you can make out the owner.
This Sparrow coinjoin[1], on the other hand, while there are remixes, you cannot tell who's who, because there are no input and output collaborations.
You are wrong, a mixer is a trusted third party, they do not provide you privacy.
Disprove my claim by de-anonymizing this 0.001 BTC Mixtum deposit:
https://mempool.space/tx/a2415334ad8b4f5d6e20175772f00a216cc889e8d5e0c972ec5ac216f18b0f06. If you can't, then I have successfully made myself untraceable to you, and therefore gained some privacy.
[1]
https://kycp.org/#/0db15af0cad74e54f5dcbdd6809806ec2b25f20642ac5e9f1e513198240264c1