There’s no questioning the value of good retrospectives, but are your retrospectives always valuable? Do they address the issues that need to be addressed? Does everyone contribute? Does everyone get value from them? Do you even ask?
There is no “One size fits all” approach with retrospectives. Whilst picking random activities may lead to a retrospective that will provide some novelty, it will rarely yield the same good results as a carefully tailored one. Those that want to try the random cocktail approach can try Retromat. (This is actually a very good site, with a great collection of activities set out in the 5 stage format. You can choose to tailor but there’s a shuffle feature.)