REW and PEQ employ IIR filters. They can't correct speaker impulse response the way FIR filtering can in Dirac Live.

That said, they are an amazing option for room frequency response at this price point, no argument.

The other aspect I am struggling with is whether I care about, or am likely to care about Atmos. Not in a living room arrangement, probably, but if I ever build a theatre, I might want to go 7.2.4. The only Dirac Live options for Atmos are either in the Pre/Pro or in the analog domain with a pair of DDRC-88As ($2000) with balanced analog I/O and a A/D D/A step. But, Atmos gets us out of 976 territory and I am nowhere ready to build a theatre.
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