Is there any advantages that I am missing here, compared to Chipmixer, Samourai and Wasabi wallets?
Both Samourai and Wasabi wallet are more transparent and you have full control your Bitcoin all the time. I would use both over any kinds of mixer.
I think you miss the part all SPV wallets cant be used alone when security/anonymity is the top priority and with the statement made by CipherTrace, chain analysis, etc I think people need to be more careful when using SPV wallet. Mind you, the shortcoming detected about Wasabi that a large amount of transaction can be bypass and I once a thread where Theymos advise the use of a mixer and SPV wallet when anonymity is the top priority.