Everything @Kazzyhoward said, plus traffic, dealing with rude fellow customers, out of stock, etc.
I’ve had the same experience. Example, I’d go to the stores where there is pricey makeup and the young women and men working there ignore you, too busy gossiping and assuming you won’t buy anything if you’re makeup-less/casually dressed and/or are older than their generation. They think they’re too cool for school and know little about products, competitor’s products, and nothing beyond the looks they do on their own faces. But they think they are experts. Never mind their commission, sales should just drop from heaven.
It wasn’t always like this.
In fact, I’ve worked high end cosmetics and never ignored customers nor judged by their clothing etc. Nor did my coworkers! I also knew about the products, competitor’s products, trends, and how to apply makeup for all types not just my own face/skin type/style.
We actually meant it when we promised the customers to inform them of things that might be of their interest, according to information they allowed us to collect.
Good luck getting that now. I have one that does, because I met her years ago and she’s a hard worker. Apparently she’s successful because she keeps getting promoted, imagine that. However, she’s the exception and not the rule.
Same going into an electronics store. Not greeted, have to hunt someone down. Did this a couple of weeks ago as my son saved up for an expensive gaming device. We did all our research online, and only went into the store to get it because I needed to see him try it on first and he was overjoyed to finally have enough to get it.
They left us to it until we were ready to buy it. Not one iota of information offered. Again, it wasn’t like that always. I worked that same company decades ago and knew about the products and shared the information with customers. Always greeted people, offered assistance, without acting like a vulture.
Most assistants now are lackadaisical. This happened often enough I just turned to buying online, most of the time.
I do like independent shops, artisans, etc. They are few and far between here, and I have to say, ones not local, I buy from their online shops. 
As for the consumption rate, people are buying more than ever. Just look at crazy “my such and such collection/haul” videos.
So no, there’s no death of retail.