It does help with employee stock compensation. If your stock doubled in the past year, then you just need to dole out 50% of shares as last year in equity refreshers to retain talent.
Maybe but people's spending also dramatically goes up as they start making more money. You buy that $5m vacation home at Tahoe, you buy fully-loaded Rivian SUVs, you send your kids to expensive private schools, you fly only first-class on family vacations, and you are back to needing to work more to sustain this lifestyle.
This assumes your staff are not a bunch of boglehead freaks constantly on blind and crunching spreadsheets and grinding their leetcode for that perfectly timed leap.
RSU vesting is a bit like options. You have the option but not the obligation to stay in the job!