I have many personal data points on this, but below is the worst i've encountered in any retail store in my life:
I went into an Apple Store to purchase 3 (yes, 3) Macbook Pro's (old style, they were in stock at the time) in early December (for some new staff that were starting), knowing exactly the model I needed. I was told I would need to make an appointment and come back in 90mins. Really? A customer comes into your shop, looking at spending over £7k without hesitation and you say go away?!?
I said to the store member that I thought this was unacceptable, it would take someone literally 2 minutes to go into the storeroom, pull them off the shelf and swipe my card.
The response was that it was now the lead up to Christmas and they were very busy and there was nothing they could do about it. My response was that they need to tell their boss(es) to hire more staff for busy periods.
I walked out without purchasing and didn't return.