* privacy: if it's not client-side only, how do I know you're not saving all my data and selling it to advertisers recruiters spammers etc?
* popularity: a random recruiter pulls up two applications and they both have the exactly same template. this is probably a bad thing. best case scenario you become less unique and more forgettable, worst case scenario they think you're a liar that has plagiarized the resume from somewhere and the contents aren't correct