IMO only, yes. I’m not talking about QB acquisition either. Returned merchandise even brand new runs the risk of being unsaleable going forward. It’s a waste of everyone’s time (that of
@OnlyModa and the SA). The SAs have very large goal posts (if not commissions), and time is literally money. I forgot which premier brand it was, but I learned years ago a bizarre factoid rhat an SA is expected to earn at least 6K USD for every hour of work at a minimum… (that figure is definitely outdated now)
More importantly, one of my SAs told me that clients who return are a category that can cause an SA demerits on their performance reviews. The implication is not that the client is indecisive; rather, the onus is on the SA to prove she did not pressure or over sell to get the client to buy something that wasn’t right to begin with.
This is also the new clients introductory visit. And, if she cannot be counted upon to make up her mind, it becomes exhausting for the SA to try to help her achieve a certain look or an end result. If the client habitually returns merchandise, an SA will be less likely to request transfers or choose that client as a recipient of a popular item.
Finally, every SA I have ever worked with has said that it is important if a client returns to do so to the SA who sold the item. If the item is a coveted one, the SA and SM do not want it to appear back in some other store inventory. And, an SA wants the chance to make a client happy and to better learn what a client prefers. This may happen if she can ascertain why a return is made.
Of course, JMO, and YMMV. Apologies for the novel lol. Returns just happen to be a pet peeve of mine which is why I would rather visit an item in the boutique a few times; not shop with friends who merely rubber stamp everything I try on; and, listen to my DH and SA (both of whom have excellent taste) when coming to a decision as to whether to purchase

My best purchases are often the result of enthusiastic consensus among SA, DH, and me.
ETA: all of the above applies to my H SAs as well as Dior, Chanel, Brunello, Loro P, and as basic as my neighborhood pharmacist.