But things evolve.
We also didn't have WF guilds doing 500 split runs and spending 20 trillion gold. Now we do. It's a system of escalating standards, and what people didn't consider 5 or 10 years ago or whatever cannot be taken as the status quo going forward. People have demonstrated repeatedly that they'll go further and further. There is no reason to expect that they wouldn't escalate this as well, as they have all other things over time, just because that's not something they did in 2016.
I doubt this would even come CLOSE to the potential harm of unrestricted PL. Especially in the broad middle segment of the population, where most of WoW takes place. Very little changes for the average player in the average runs. You only exchange different extremes, and limit where and how much those extremes deviate.
Already happened with PL. Got an item you don't need? Sell it for gold or tokens. I remember Ra-Den trinkets in Ny'alotha. Happened many times exactly like that.
There is absolutely nothing suggesting that you can roll Need on something you couldn't otherwise just have gotten from PL. Effectively, PL is just everyone rolling Need anyway. Now you can get people who pass.