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Originally Posted by amy2203
and if we're talking about upgrading from 4.4 up, isn't that going to be to v5 which may need to work with Drupal templates which may be a huge difference?
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Don't forget about upgrading between 4.4.x versions and between new versions of third-party modules and themes.
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Originally Posted by amy2203
templates cannot be upgraded once modified anyway so how is splitting them into multi folders etc help? One of the biggest hurdles to upgrading is having to redo all of the templates
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The cascading multi-folder system allows you to overwrite only the files you want to be modified. The system will "inherit" the rest of files from the default template.
For example, we decide to release several templates having exactly the same layout but slightly different colors/images. Instead of releasing and maintaining each template in its own package, we just develop a "main" template and release it with several small sub-templates.
Now:
a) if we find a bug, we fix it in the main template only; that makes things much easier;
b) if a custom skin was made as a "sub-theme", fixing the bug is a very easy task: you just overwrite all files of the main template with new ones
With a small tweak third-party web designers can switch an X-Cart store to a custom "main" template and release their skins as a main template plus several sub-templates.