Full Stack is the same discipline as the base retainer with the constraints removed. On Local SEO Management I am working within a fixed monthly allocation, which means when your site has a technical problem and your content is thin and your review velocity is behind, I have to pick one. Here I do not have to pick. Technical fixes, content production, on-page work, and review campaigns all run in the same month.
That matters most in a competitive category. If three companies in your city are all running competent local SEO, the base retainer keeps you level with them and Full Stack is what pulls ahead — because the compounding assets, published content and technical health, are the part most competitors never get to. It also matters if your site has real debt: slow pages, missing schema, an internal link structure nothing can crawl properly.
The trade is that it only pays back at a certain size. Two to four posts a month and ongoing technical work is meaningful spend, and it needs enough transaction volume behind it to return. If you are not sure whether you are there yet, the audit will tell you, and it credits toward whichever retainer you land on.