Why isn't Shopify improving its user interface and pricing options?

[PasiJ]

Relentless apps is a two man company  with a App Variant product options. I wonder why Shopify is not doing itself such a everyday option that is needed in many applications. It works in one language with quitte glumsy way. Totally new user interface style compared to Shopify - and poor. When a user has offering in various languages, then the catastrophe is waiting. Prices do not cannot be updated after first setup. You have to go inside code and change them there. They are asking nearly 20 €/month about poor solution. My question to Shopify is: Why you are providing external supplier (startup, that obviously have poor international capability) with poor user interface and highly priced? Can you improve the uniformity of the user interface so that it is not like coming other planet compared to Shopify?