Protein powder is a "supplement," sometimes falsely referred to as "meal replacements" suggesting that meals may be replaced by protein powders
However, a meal here or there can be exchanged for a protein shake....
BUt honestly, is the only thing you'll allow for your "dinners" steak? What about, as was mentioned, chicken, fish, pork, eggs, turkey, cottage cheese, etc....
And dude, protein shakes aint gonna do the filling up job
P.S. Different protein sources have different bioavailabilities and digestion rates. Steak, for example, is less bioavailable then Whey protein (if thats what youre using) but has a different amino acid profile and ratio, not to mention a longer digestibility. Casein proteins have less bioavailibility but slower digestibility than whey.
These are things to take into consideration.
Dont eliminate your steaks, explore other sources.
What kind of protein powder do you use, p.s?