I've been an Amazon fan for a while. When the first lockdown started here in the UK, it was anarchy in the retail world. I needed a few bits after the first month: household MCBs (fuses) after some power issues and a new mechanism for our toilet. All 4 of the national DIY retailers were unable to handle online orders. Some simply removed the Pay button. No note explaining they were closed, you could browser and make a basket, register, put in card details. You just couldn't find the Buy button.

They continued to sell "essentials" like wallpaper and flowering plants once they opened. But they wouldn't sell other items like the ones I needed. If it wasn't for amazon, I'd have literally been sitting in the dark, filling the cistern with a bucket.

That's amazon's killer app: basic competence and taking some vague interest in customers needs rather than profit margin and half arsing everything and being allergic to basic tech and customer experience.