Employers generally use the same contract for all their employees so employer/employee forced arbitration contracts are only a minority of contracts. If a contract is between two corporations each with their own lawyers to review the contract that giving up of their rights to sue each other is actually a good thing. But that depends on the arbitrator being acceptable to each and desiring repeat business from each. It's the employer/employee situation where only one side has lawyers involved in selecting the arbitrator that the situation becomes abusive.

The parent may agree with you, but they said that in a somewhat obscure way. I believe their point is that companies have many distinct contracts with other companies (good) that contain arbitration clauses, and that employers have a smaller number of distinct contracts with employees (bad) that are duplicated thousands of times over.