peas can be just as hard to digest as dairy
when something is hard to digest, you get inflammation... and actually ANYTHING that your body has to digest will give off inflammation. does that mean we should never eat? no, but when you are due for a break you should implement fasting
the crux of the issue here is the argument that you NEED a protein powder to build muscle. that myth was started mostly in the 80's by Joe Weider and his propaganda magazines that pushed these supplements to naive people. since then the myth won't die. that is why you see every 20 year old bird chested kid literally RUN to the protein bar after their workout cause they think they have to get a shake or they will lose their GAINZZ lol supplement companies spend billions a year telling you that you need protein powder and they use PAID meatheads to push it.
you don't need a fucking shake to build muscle. eat real food, the body knows the difference! and if you want a supplement get n2generate, it will raise your T levels naturally and safely without sacrificing digestion