I want to take @Jdlrobson's demo and list all of the UI bugs it creates for each different approach for ~ 3 different pages. @ovasileva and I will then go through those bugs and give them each a priority ranking. The goal is that this will create a proxy for "how broken" templates become with each approach from a design perspective.
@DTorsani-WMF has agreed to help out as well with a sober second look in case I miss anything.
This should help communities understand the impact to UI quality each approach entails and whether one approach is better than the others in this regard.