You may be right but in my experience, uneven loader arms can lead to an unlevel bucket.
Just two of the seven new Kubotas I've bought from the same dealer over the last 45 years had the FEL bucket out of alignment. I think it was just a matter of how they were assembled, rather than a quality defect.
Depending on how they are used, or misused, many FEL buckets and loader arms get torqued out of alignment. I would prefer to have an adjustment of some kind rather than have to reverse torque the FEL to straighten it.