I have developed the most 'fit for purpose' Shopify OS 2.0 theme in the world for SEO.
I ignored Shopify for years because of its well known technical SEO flaws. All you have to do is Google SEO ISSUES SHOPIFY
& you'll see my article #1 all over the world on English speaking search engines to discover what they are.
I worked with a small number of high-value clients and when my agency nearly went bust as a result most of them migrating to Shopify...I just had to find a way to get Shopify's cloud based platform to perform in the search engines so I could continue delivering my high-end e-commerce service to my clients.
I knocked on their door for over 2 years, asking can you please fix this, can you please fix that...