they're not. the point is in a traditional setup the company springs for standing desks as a perk. in a unionized setup it's better to hold stuff back for negotiations. this is the flip side to collective bargaining, you kinda gotta go through "The Process" for everything. there's also the considerations that 1. unions sometimes don't like the workplace just adding perks bc it's perceived as "undermining" the union and 2. unions will always push for more even if you add a perk like new standing desks (bc that's their job) so the workplace kinda has to always push for less so they come to a middle ground compromise.