Strategies that "don't work anymore" -- when a trader talks about those, or says that "no strategy works forever," my inference is that the trader lacks a basic model of how markets actually work.
A trader who develops one or more basic models of how markets actually work does not bother with such "strategies," because the basic workings of markets are constant across all markets, at all times, & for all timeframes.
If you can develop a model, or models, of how markets work, why would you bother with strategies that are at the outset considered ephemeral ?
This view chimes with the observation in the above video that
"... the existence and knowledge of the meta way to complete any task renders every other approach of that task at best inferior and at worst completely pointless. To put that simply, if there exists a way to catch a 100 fish in an hour and another way to catch 50 of the same fish in an hour, why would you ever choose the 50-method ? You'd be limiting yourself, which means the 50-method may as well not exist, it's completely outclassed."
A basic model of how markets actually work enables a 100+ method, and all the ephemeral "strategies" are sub-50.
An important caveat is that
having a basic model of the market is not sufficient -- trading it is a different task, and especially difficult if one is at the same time elaborating and refining the model, or models -- just like the video reference to multiple metas and the need to coordinate them.
A model may precisely capture important nuances, seeming contradictions, and "surprise" events in the market, but that does not assure that the trader will detect and respond appropriately to the modeled-scenarios when they instantiate in real-time, especially if there are multiple inter-related models that require simultaneous coordination.
In my opinion, the solution here for the trader is:
- Trading at higher time frames,
- Trading fewer tradables, and
- Trading automation (write software! -- one more task for the trader...)