Assassin/Lethality Xayah seems like it could be viable

Now I know she's just been released, but I can't be the only one who thinks this (Unless I'm missing something and this is a really bad idea). Here's why I think it could work:

Black Cleaver almost fully procs off of her Q > Auto > E combo, and, if landed, the combo snares. Your ult can be used as an escape or and engage because of the intargetabilty. You also get MS from W which makes you inherently more mobile, especially with phage passive. The only thing that I think she lacks is the level of mobility relative to champs like talon, or zed. Though I also I think her relative lack of mobility is made up for in her ability to snare multiple targets with her ult.

This is just a theory but I feel like assassiny Xayah is a better fit for kit than a traditional adc build (Crit, AS, etc). I guess there's always the experimental phase that all new champs go through, and this is nothing new, but I thought I'd give my 2 cents.