I agree with most of your post, however, having unconfirmed inputs in a regular size does not prove they were mixed by chipmixer at all... I could easily use some of my unspent outputs in a transaction that generates new outputs with the exact same value as chipmixer's chips...
It does not prove they were mixed by ChipMixer... but maybe they were? Lets say you are a blockchain analytist. You encounter ChipMixer-like output. You assume there is 50% probability it may be ChipMixer, so there is 50% chance no link between input and output. You have just gained some fungibility even when you do not use ChipMixer.
Creating your own chips make blockchain analysis harder. We encourage everybody to do that.
I 100% agree with you. By using chipmixer you are essentially increasing the fungibility of your bitcoins. There is a risk of your bitcoins 'worth' less or being blocked by exchanges or other entities if they can be easily traced, but using chipmixer avoids direct connections, meaning that interchangeability is improved.
Receiving 'dirty' coins is always possible, and the risk of that happening on chipmixer is no more likely than on other bitcoin mixers, or even if you just received a regular bitcoin transaction without mixing.
@ chipmixer What do you mean by creating our own chips though? You mean off the site, just loading some regular sized chips ourselves?