^^^
sure.

essentially, the software is measuring the frequency response of your speakers... "most" speakers will have a -3db rolloff below the standard xover of 80 hz... because of convention set many years ago, it then decides "run these full range"... there's a bit more to it, depending on the flavor of room correction, but you can think of it in that way...
but in the "real world", there's several other factors that come into play...
- just because speakers "will" produce frequencies below the xover, doesn't mean they will product them "well"...
- for the great majority of users, their sub will do a "better" job of producing those low frequencies...
- for the great majority of users, the placement for "best bass" isn't the placement for "best imaging/soundstage" (especially in a common living room setting, with no treatments, etc.)... even if you have mains that reach quite low and do it well, it's unlikely that they will produce as good of a frequency response as even a shoddily placed sub...
there's more... but unless:
- you have mains with built in subwoofers
- you have speakers that will reach exceptionally low (and do it well), and have paid careful attention to placement and acoustic treatment... edit: and even in that case, i'd still (and do) use bass management for ht purposes...
you are virtually guaranteed to get better results by setting your speakers to small and using bass management...