I dislike this because I need to share sensitive information, keep track of accounts, get spammed by notifications and be one of hundred applicants in an UI.
What happened to conventional email apply? Would you use a tool that utilizes job search from linkedIn but gives you the ability to apply over email? Does something like that already exist?
Most of the time these jobs are posted on a lot of platforms, including the companys own website and not just on Linkedin.
I never had a problem finding an email address of a position by just looking at the website. If you apply somewhere looking at the website should be part of your application process anyway.