@audio2920
Just to make sure I have this right - if a mix gets its low bass levels reduced for a home mix to prevent low bass buildup, that reduction is done to the speakers or the LFE?
Short answer; I would probably reach to adjust the "speakers" first.
My logic being, in the cinema we had no bass management on screen, and when in non-Atmos we had no bass management at all, with surround speakers that probably give up at 60-80Hz or so. We also had speakers that probably didn't reach super low for the LCR. So now we're listening in HE, we're (a) mono'ing the bass together which may sum too constructively and (b) getting an octave extra. The LFE meanwhile is likely doing it's own thing with specific content that's de-correlated phase-wise; and that hasn't been changed by moving to an HE environment, except it now gets married to the BM. So, to my mind it's the summing and extension of the main speakers that's new when we go HE, not the LFE, which is a simple discreet track that goes to the LFE bin. (As I've said before, that's actually untrue, as the phase correlation of the material in the LFE to the mains *does* matter, it's just I have to start somewhere!)
Longer answer, however, I do temper this approach against the fact that when the mix eventually makes it's way to 2.0, the LFE will likely be removed completely, so it's no good me removing all the "speaker" LF just for for the sake of leaving the LFE full level, so sometimes it ends up being a bit of both. In the end, if the HE listener has bass management, I don't feel it matters so much how the bass gets to the bass bin, so long as it gets there. But for those that don't, I don't want to restrict the main channels unnecessarily. It's very much case by case and content dependant.
I should re-iterate that all of this is only in cases when it becomes a problem, and often even when needed, the adjustment is slight.
Not to confuse things further hopefully, but, there have even been a few cases (when there's the headroom to do it, the content in the LFE is more 40-100Hz than 20-40Hz, and it's important content) when I've taken the cinema LFE and deliberately re-directed it to the HE L/R pair or center channel, setting the level so the end result (with BM) is relatively the same as it should have been in the cinema. There are advantages and disadvantages to doing this of course, but sometimes I've found it gives me the ability to wrangle things better, and then the bass (ignoring what the surrounds bring to the BM party) retains an absolute relationship with the screen content, even in 2.0 or sub-less HE. Whether the consumer's speakers can repro it is another matter; but at least it's there for the taking if someone wants to BM it or have big screen channels, a big stereo system, or listen on headphones. This is rarer for me, as mission critical sound is rarely in the LFE in the cinema mix, but I have done it!