Well it should be adjusted, yes. You could change it by just generating a bp based on how much scrap you've inserted. The more scrap the higher the bp.
I've also suggested this a while back: Upgrade Workbench instead of making a new one
Well, "the whole system again" is a little bit exaggerate. But you could have it so that a WB lv 1 experiment generates 100% lv 1 BP, a WB lv 2 has 25% lv 2 BP and 75% lv 1 BP etc. . . something like that. They just added experimentation and are still seeking what the best imp...
For one, I love the new BP system. One thing I like a little less is that we have to make a complete new workbench to craft the new tier. I'd rather upgrade the old one so my base doesn't fill up with workbenches that I don't use.
Upgrade Workbench instead of making a new one