I have noticed this too, definitely as an effect of the pandemic! I work with multiple SA's since there really is no one stop shop for everything, and the items I shop for are quite specific. Also, there is a difference in merchandise available between Dallas (my home) and the bigger markets. Rookie SA's are great if they are hungry for a sale- and yes, they can commit time to your search. That being said, retail is a competitive business and the rookie's may not have the inter-brand/retailer network to get really special merchandise transferred to their store for the sale.
As shopping is a large part of my business, I treat my successful SA's well- not like some clients, I'm sure- but I will bring them a coffee or get them small gift cards if they work particularly hard on a search. Keep in mind, many stores have gifting policies (where SA can not receive a gift of over $50-75 in value) but I think a lot is done under the table. I do what I can to show my appreciation!
Great topic!