yep as in leave it on all the time! schiit actually used to officially recommend leaving their dacs on all the time way back in older yggdrasil manuals:
If you have a gungnir a2 and love it, I'd stick with it. The gungnir a2 is more a true neutral, whereas the bifrost 2/64 is pretty neutral overall but slightly v-shaped, which may or may not work for you. The gungnir a2 sounds very very good from balanced outs, but can sound a little "greyer" in the background compared to the bifrost 2/64, which has a blacker background from memory. I think they have similar levels of engagement, microdynamics, and nuance, but the gungnir a2 may just slightly edge out the bifrost 2/64 there when using balanced outs. hard to tell though since I used the gungnir a2 and bifrost 2/64 with different equipment-- I think they're more on par than anything
While I would not describe the gungnir a2 or the bifrost 2/64 as "rich/lush", I do think that both will have smoother treble than the modius E after warmup if that's what you're looking for. If you're looking for a warmer sound and want to stick with schiit multibit stuff, the bifrost 2 OG and gungnir a1 could are richer/lusher but at the cost of some technical performance/engagement vs the newer versions. On another hand, the yggdrasil LIM would probably be the best of all worlds with better technical performance and a smoother sound, if you have the funds for it.