It's quite challenging to ingest 150+ grams of protein per day, especially when you restrict your eating to a 6 hour window.
Any good reason not to get 100g of it from protein powder?
nope, whey protein is one of the best protein sources you can get 
https://www.researchgate.net/figure/EAA-concentrations-of-various-protein-sources-Differentiation-is-made-between-plant-and_fig3_280584886
https://www.researchgate.net/figure/EAA-concentrations-of-various-protein-sources-Differentiation-is-made-between-plant-and_fig3_280584886