The people who thought that providing customers with a template engine to build reports was a good idea - they made a mistake...

Users can't and won't understand a 500-line template file with 'content', 'columns', 'stack' and 'data:image' in it, and nesting levels reaching 10+

Now I have to build those reports with the added complexity of working around template engine limitations.

Can't blame the people who originally invented it. I can see how they might have thought their idea with those templates might have worked out. But it didn't work out, sorry