The main issue with any of it is format; because there isn’t a standardized format for wages, bonus, benefits, perqs, equity, etc., it’s easy to make claims and time consuming to compare, e.g. shop employers. This is mostly by design. It’s the same with hiring/job applications. Honestly I think that blockchain is the silver bullet for hiring; universally verifiable information, credentials, job requirements, etc.
Luckily, transparency in pay is inevitable, but it will of course be left up to private employees to get aboard so most won’t and we’ll be stuck decades behind outher countries in the US.