Because if your speakers can do 35Hz, why not let them?

It's less likely to have strong room nodes if the bass is coming from more speakers than just the sub (s)

Some people prefer to off load their main speakers for better midrange performance.
I prefer distribute the bass and let the speaker do what it was designed to do, go down to 35Hz.

But by all means, experiment.

- Fiddler (IMHO)

If you think listening to music is fun, try learning an instrument.
HT: G61RSL, 4x5K, 5.5KHC, 2xSC6000, Transporter, HD621, Philips BDP7501 4K, Tivo, 65" LG OLED 4K C6
Computer: Foobar2000, 5K, Mojo, HiFiMan HE1000 V2