tl;dr I personally appreciate the short-term benefits of that kind of diet, but in the end the long-term health and moral implications of a diet that requires the macro-nutrient profile it does, I'm now plant-based and it's really changed how I see food and nutrition.
I did exactly what you're talking about for a few years when I was about 22-25 and lifting a lot, kicking grad school's ass, and banging college girls all over Boston in the three years I lived there. Arguably the best years of my life so far. High-carb, low-fat on working days; low-carb, high-fat on rest days; high protein throughout. I was eating up to 6 servings of peanut butter each rest day by the spoon. I certainly felt great, got in to the shape I still essentially am in 18 months later, and was the strongest I've ever been thus far. I should say that I was also doing this quite "cleanly" in the sense that my carbs mostly came from navy beans out the can.
I lost my strength and have been slowly crawling back ever since after a bad case of mono I caught in Chicago but that's a whole other story. Just making that point so that it's made clear I didn't lose strength because of my diet change.
The way I transitioned is to vegetarian first then eventually to a plant-based diet. Meeting a lot of vegetarian girls helped for sure but I started, over my last year or so in Boston, by not buying meat at the store. I substituted soy and seitan and used them as substitutes. I would still order meat dishes at/from from restaurants whenever I wanted. Then after a while of that, and falling in love with Thai, Vietnamese, and Indian cuisines while in Boston, I realized how easy being vegetarian actually is. I also watched "Earthlings" thanks to one of those veggie chicks, and then that kicked off me watching like 4 more documentaries about the farm and food businesses. That's when I had to give up meat. Then I did essentially the same process with eggs and dairy when I moved out to Vegas and figured I cut out meat easily enough, and knew how cruel the egg and dairy industries are, so I no longer had an excuse to consume those. I have kept it going, quite easily now, in San Diego.
The only real difference at baseline now I've noticed is no GI symptoms from one sphincter to the other at all, unless I overdo the spiciness. I will say that I remember initially caving in the past after like 6 weeks and getting a meat-lovers pizza or something ridiculous, I could immediately feel my blood pressure rise. And my core would be markedly weaker in the gym the next morning. And my farts all reeked again. And, as I mentioned, the bloating and feeling of grossness
