In March 2018 I was looking at a variety of different ECommerce Marketplaces and was comparing their strategies with the aim of going to work for one of them. In the end, I took a job with Sellics as their Head of Marketing, Sellics builds SEO / PPC /Business Efficiency software for Amazon stores.
This video has a good hard look at website speeds, user experience and more and the challenge faced by Etsy as their business model moved from being the only or main point of sale for most of their customers, to being just another channel.