Of course, but it’s hard to argue that because a trade is advantageous to you, you cannot attempt to create the conditions where it’s even more advantageous. And in negotiations, you should strengthen your BATNA (best alternative to no agreement) and that of the other party’s. So you could see class struggle as a strategy to improve the starting positions in a negotiation, if that makes you happier :-)

There’s a market for labor too, so it’s not like most people have only the choice of one employer’s offer or starvation. And no one is arguing that we shouldn’t have a social safety net of any kind to improve the BATNA of employees.