We are upgrading our apps from 8.1.1 to 8.4.1. 

As part of that process we are adopting to Cosmos Design System Converting our Sections to Design Templates.

We observed for our existing UI if we use OOTB design templates we end up creating multiple sections for our need.

We are trying to understand is there any challenge or risk in creating our own tempalte which uses pega OOTB styling from cosmos skin? Will it work seemlesly with future upgrades and react based features in 8.5 or 8.6 and beyond?