I bought a copy of Brilliant Diamond to relive my childhood and for Piplup. But I still think you're better off emulating DP/Plat. But just emulating platium. for the full experience gen 4 experience.
For what its worth for a person or kid, with 0 experience to gen4, to play a 1-to-1 remake... its not that bad and I enjoyed the small nostalgia trip. (and if they aren't tech savey to emulate.) I played till completion but I honest to god scream at Nintendo for not just remaking platinum.
But Im a bit biased as I don't think it was worth a full price tag again when I played the originals and when there no significant changes.
the most hand held thing I carry around is my smartphone or ipad these days. If I'm traveling then a laptop.
My switch has some joycon drift that infuriates me to bring it with me when I travel. I used to bring my DS and GBA with me, but then I was told to watch my surrounding areas when im traveling instead of gaming.