In poker there is an unwritten rule applied to players: "Apprentice of everything, master of nothing".
There are few professional high stakes players who specialize in various modalities. If you want to be very good and compete against the best, specialization is necessary, that is, use all your time and energy to learn a modality, otherwise you will only become a standard player (neither too bad nor too good).
You will not hear players like OtB_RedBaron or LLinusLLove say: “while I was learning Hold´em I also played Omaha”