he hasn't got less strict on the issue. it was just people were not eating veges during P+F meals, when its perfectly fine to do so. which is why he explained it as P+F+<10g carbs.
and it works perfectly fine because if used properly you wont have both in the blood stream or very little. the idea being you eat P+C meals around workout,if you workout after the job at 5pm, youve spent more than half your day with little carbs in your system, using all P+F meals until them, which keeps your insulin low.
most people don't think it works becuase they mix P+C meals around all day.
and no, its not as simple calories in vs out. Adding 1k calories worth of olive oil to your diet during a bulk compared to 1k calories worth of twinkis or soda will yield much different results.
carbs before bed? have fun not sleeping.
aside from that splitting meals this way makes it easier to track macros and get better foods in, otherwise its easier to be like oh well pizza has C+P+F so its all good! eating a large % of C+F in any meal will cause you to store fat regardless of overall calorie consumption. Try eating only pizza inside your maintenance level, youll still gain fat.