The issue with themes as they are implemented right now is that they are way too abstract.
The benefit of being abstract is that you can create one theme and it works across all transaction types but they are really pain to customize and understand.
For example, it’s extremely painful even for me to reorder columns on theme. For example for Qty column to come first. This is because due to theme being so abstract, it has no concept of Qty column.
I will be making changes to make themes a lot more easier to read and customize. Liquid markup is not the problem - I think it’s brilliant. The problem is how default theme is written and this is what I want to improve on.