If only retail stores had websites like Craigslist! Just last night I was in one trying to do a simple search for a fairly common item (on my phone). After waiting between 20 seconds to a minute for search results to return, then trying to click the "search in store inventory" checkbox 12 times (sometimes because I wasn't sure the tap had registered, sometimes because I thought the page hadn't finished loading before I tapped it, etc), I finally just gave up after 5 or 10 minutes of struggling with it.
I had a decent signal (3 or 4 bars, I believe -- about as good as I ever expect to get in a store), but the web pages on so-called "modern" websites are so bloated and inefficient, sometimes it's a miracle to get anything done on a normal residential home internet service, let alone on a phone.
And before someone suggests it, NO, I am NOT going to install a stinking app from every store I visit (not that they'd be any better, most of the one's I've seen I would describe as "barely functional -- sometimes").
It would be interesting to know how many sales stores have lost because a customer was trying to search for something in their store via their website, but the experience was so miserable they just gave up.