This all depends on your cooking and storing procedures. Here is a scenario where it would work, with a chicken breast as an example: Bring home your fresh, unfrozen chicken breast, give it a one minute or less sear in a very hot pan, package in vacuum bag with or without herbs or seasonings (but no salt), cook sous vide, chill, freeze. When ready to use, remove from freezer and reheat in water bath, remove from bag, sear for crust formation, final seasoning...hey presto! Dinner.
Here are the issues I see:
- You brown for flavor and texture. Texture is lost if you don't brown right before serving.
- Freezer burn is always a risk, but can be mitigated by the removal of air from packaging, thus vacuum packaging.
- All freezers go through freeze thaw cycles, texture degradation is also likely, whether this happens more readily with cooked vs raw food, I do not know.
- The flavor will likely not be aided through this process, so I assume you are suggesting it for convenience.
You'll have to decide for yourself, but it could be worth it (weighing the quality pros and cons) to cook a lot of proteins when you have time and re-therm later when you want to eat. It depends on your own workflow.