Parallel? How do you set the VTA?

I don't change VTA when changing records -- that would require not only repeatable settings, it would really require listening and finding the ideal setting for each particular record. That would be a lifetime project.

I can hear the difference when I make surprisingly small changes in VTA by moving the arm up or down at its base. Whether this is really attributable entirely to a VTA change, or whether a small change in tracking force is also involved, is really an academic issue -- I hear a change regardless of the actual cause. But, I cannot see it being worth the effort to optimize VTA each time I play a record.

If differences in record thickness, and the resulting effect on sound, is that big a deal to someone, perhaps that person is a candidate for a longer arm -- the length will reduce the VTA change for any given change in height of the record surface.

The only way I could see myself doing album-by-album VTA adjustment would require ownership of a rare Air Tangent arm that allowed for motorized VTA adjustment by remote control. That way, one could actually hear the change occurring on the fly. I don't see listening, getting up to do an adjustment, then sitting down to listen to be enjoyable, reliable, etc.