Deca is frowned upon in first cycles because of sides. the sides arent bad but lets say for a first cycle you run test and deca at a resonable dose. You get sides of gyno. How do you know what from? Do you want to take an AI and a dopamine antagonist at the same time? If that stops it how do you know what compound caused it? If you dont know what compound caused it then in future cycles you might run into it again. I know after this cycle that my sweet spot for Test E is around 750mg, Dbol at 40mg and Winny at 40mg. I know exactly how my body reacts to both and what sides to expect both good and bad. Now I can start bringing in more compounds into future cycles. If new sides I have not experienced pop up I can attribute it to the new compounds and treat them from that angle instead of a shotgun blast approach. Its frowned upon because of inexperience of the user with the compounds not because of the actual compounds. Test sides are usually from aromatization and deca sides are progesterone related. Both manifest almost the same and can trick you but are treated differently. Armidex will control estrogen but will not stop lactation from your nipples. while Caber (a dopamine antagonist) will stop the progestrone sides (lactation) but not aromatization.
Now that I know what to expect from the compounds I ran my next cycle I will try Test, Tren and maybe Masterone with a anadrol kicker to see how all of the compounds treat me. Over the next 2 years I will try just about everything by running 8-12 week cycles and then I will start building a 5-8 year plan of how I will run compounds to start competing in fitness and bodybuilding. All of it is long term goals but I am doing my due dilegence in learning now instead of failing in a contest prep because I got impatient.
Damn that is some long a$$ focking typing lol. If you got more questions hit me up brother I dont mind at all. Hope it helps