In principle, sure, we can all "say" it's easy to pierce an LLC. But in actual practice, it's harder than you think to do and it represents a significant financial investment to overcome that hurdle.
To make the case that the LLC should be pierced, you need evidence, and that evidence needs to come after discovery, and possible depositions. You might need to hire experts to provide testimony on what an LLC should and should not do. Experts are not cheap. The attorneys will file motions challenging this type of evidence, and there'll be papers going back and forth trying to exclude it or not. None of this money spent is related to the ultimate question of liability. It is just a side skirmish.
Even for the "good" plaintiffs' attorneys, they won't consider this "easy". I bet this whole process costs $50,000 in fees in California.
I look at it this way, if using an LLC will eliminate 30-40% of unsophisticated, lazy, or financially challenged plaintiffs and their attorneys, would you do it? Probably yes.