Yes you could hit your numerical protein targets by taking shakes only as your main protein source. However you’d be excluding a whole host of vitamin\mineral, fibre, electrolytes, antioxidants, healthy fats and countless other trace elements from your diet. The bio diversity of protein from shakes doesn’t come close to comparing with the diversity you get from food based protein.
Any supplement should be just that, something that ‘supplements’ your diet, not forms the base of your diet. Don’t get into the habit of relying on protein shakes, it’s easily done and takes effort to break. I only use shakes now for my post workout drink as it’s quick to prepare, gulped down in seconds and rapidly absorbed into my system. Other than that, protein shakes are a last resort when I’ve been caught short and it’s either that or fresh air.
Yes it will take more effort preparing your meals but that’s the key preparation, otherwise you will lend up reaching for the blender. Prepare you meals at least the day before and you’ll find you rarely have to rely on protein shakes.
If you do find yourself caught short and it’s a protein shake or nothing then ‘beef it up’ with some whole foods such as fruit, nuts, oats etc. At least then you’ll be eating something that is more nutritionally similar to food.
The old saying, “food first” couldn’t be more apt when it comes to bodybuilding nutrition.