Hi,
For me, it depends on the gig. When I know the sound system and sound company is good and I don't need an amp, I don't haul an amp. It doesn't matter if I'm using IEMs or just floor wedges. If I know I don't have to worry about being heard and an amp is not necessary, I don't bring one. I've played clubs and casinos from Southern California to Las Vegas without an amp. When we fly out of town we get backlined, so I just have to walk on stage and plug in. That's really sweet.
If it's an outdoor or indoor gig or with a unknown sound company, or we're running our own sound, I will at least bring my MB500 and 210 cab to use as a stage monitor for my bass. This is my go-to rig for most of my events.
If I know it's a large outdoor stage I will sometimes bring my 410 cab to make sure I can hear myself on stage. But we work with such good sound companies with good gear all the time. The band will often put bass and everything else in their monitors, especially on larger stages.
It's rare that we get a sub-par sound company to work with. Plus almost half of my gigs are backlined. I've fallen in with a good group of players who call me for good gigs. So my "no amp" experience is quite enjoyable. I almost never have to fill the room with my amp and I always take the DI from my amp into the FOH. I like keeping the stage volume down. I used to think that more watts, more speakers, more volume is better. But I've matured. I bring as little as possible and let the sound company do all the heavy lifting.
If your gigs are different, then you'll have to make your own adjustments. All I'm saying is, I don't have any hard and fast rules when it comes to getting my bass sound off the stage and out to the audience. I'm very flexible when I know I can trust the FOH guys.
Thank you for your indulgence,
BassCliff