Employees usually get restricted stock until there is a liquidity event.
ROFRs are the only restriction I've seen widely enough to merit calling "standard". Everything else exists in different forms in different companies, all the way up to being wholly non-existent for some combination of employees, executives and institutional shareholders.
My work involves helping private companies raise capital and investors (mostly institutions) sell privately-held positions.
Your experience is working with investors. Your advice makes more sense from that point of view. Employees are rarely (read Never) afforded the same privileges as the investors.
No need for us to boot-lick and perpetuate a minor injustice against employees and labor here...especially one that is causing long-term harm to the ecosystem.
A right of first refusal (ROFR) is a reasonable transfer restriction. So is a lock-up period, e.g. you may not sell these shares within N years of getting them. Bans, on the other hand, are not. For a common stockholder, requiring board approval is a cutesy way of saying "ban".