Yes, these sets are worth it as they contain various meta-relevant cards for competitive players, a large selection of rare and unique special art cards to collect, and several valuable chase cards to entice investors to buy the stock.
There are set symbols, copyright dates, and all sorts of information that make it clear where a card came from
Even without infect creatures, Hapatra itself can spread -1/-1 counters whenever it deals damage
The app does an awful lot of hard work for you, but it means you dont have that tactile experience of tucking your Energy card under your active Pokmon, or placing the damage counters on your monster when attacked
Three grading services dominate the Pokemon card market, and each has strengths but for Japanese cards specifically, the numbers favor PSA