I use Hyrpland, and so there are times where I need to use GTK or Qt tools. I generally don't like KDE-based tools though because they are dependency-heavy.
I don't use LXQt itself, but its software suite is nice if you want a Qt desktop with a tiling window manager. Looking forward to it landing in my distro. 👍
Note that LXQt doensnt include a window manager, but runs independently on top of others like Sway, KWin, Hyprland, Wayfire (Wayland) or Openbox and others (XOrg)
2.1.0 brings us Wayland? Very exciting! Definitely will check it out (as a full session), as I always pick apps from either XFCE or LXQT for my tiling window manager set up. I've been using Thunar lately, though I'm open to switching back to pcmanfm if I want to.