Yep, LX can be bass shy when it's underpowered. Surprised me for sure, I was like "where's the famous bass?". Turns out it needs real power (with proper control) to get those woofers woofing. I find the LX is a very balanced, slightly warm yet rich and organic IEM with TOTL technicalities, build quality and comfort. And when you need it to, it can fire up the subwoofers no problem. It's easily my favourite all-rounder IEM and I struggle to think of anything, even Traillii, that can do everything it does as well as it does with my type of music...
...which is, as you say, the likes of Lorde, Billie, Lana (Del Rey), Lily (Kershaw), Rosie (Thomas), BEYRIES, Brandi (Carlile), Angel (Olsen), Dido, Christina (Perri) and Maggie (Rogers), to name just a handful of my absolute favourites.