I'd say prior to Xbox one, MS was known for it's services, power and even if somewhat limited, strong AAA titles (mostly MP which complimented the services) such as (Halo, Forza and Gears).Yeah. If you want to play the power card, it needs to be at launch to own that title for the generation (or half gen). There's always one console that bares the mantel "most powerful console ever" and if you have that, you can use it as a significant anchor point for your branding.
On the flip side though, we should look at Nintendo. Never the most powerful console but they manage great sales (here and there). As oft discussed, imagine a competently powerful Nintendo console with both the Nintendo stronghold library and the full glut of cross-platform titles in their native glory. How much are people going to value Nintendo's whimsy and execution over a few more frames per second or higher DF pixel counts?
I'd say MS are the most in need of the power crown at the moment, because they haven't a notable identity outside of that, at least to my mind (maybe market research shows otherwise?). I mean, PS is known for its blockbuster AAA titles and diverse library. Nintendo is known for Nintendo classics. MS's strategy hasn't been consistently applied, so XB has been the hardcore multiplayer shooter platform, and the Kinect family games machine, and none of that has stuck. At the moment they have a value-add subscription service. "Xbox - the cheapest place to play" - is that a slogan MS wants as the base of their strategy? If MS doesn't have the most powerful console, what's their primary message going to be? What's the tag-line/offering that people will identify Xbox with? "Play Anywhere" would be quite a good one IMO if they could establish that.
MS abandoned or under appreciated that formula with respect to power this current generation but I think they will push aggressively to reclaim the power mantle as well as add to the range of AAA offerings along with BC next go around. MS will probably up the ante with gamer pass next go round.
Sony will likely continue to develop AAA titles as well unique experiences that may not experience as much commercial success but round out the library and give the ecosystem an identity. Sony is going to have a lot of backlash if PS5 isn't BC but I also think Sony will be pushing for cutting edge power for next generation VR.
And Sony has a very good streaming tv service even if PSN does suffer slow download speeds at times or occasion outages. Sony is approaching services a little differently than MS and I think it makes sense given their strengths.
Two different approaches which give consumer choices based on their preferences.