That said, Apple's usually pretty good about shipping things erring over spec, and publishing the low side of the real range. It was probably at least the spec amount when I got it.
It even supports plugged-in iOS devices https://i.imgur.com/nSIJrar.png
What's the best way to slow battery degradation if I use it for 8-10 hours daily for work? Run MBP from an outlet and do full discharges once a week? Run MBP from the battery and recharge the battery when it depletes? Run MBP from the battery, but charge it only to 80%?
There's something to be said for occasionally running the battery down to zero and charging it all the way back up, of course, but I wouldn't think of it as an effective regimen with current battery tech.
I'm also not sure how quickly it's expected to drop in capacity. IIRC, batteries drop a notch when they start getting used, plateau there for a while where it mostly depends on environment (try not to charge them when it's 110deg ambient, for example, overheating will kill a battery fast); then eventually drop again and start heading on down.
And, of course, all of this scales by how cold it currently is ambient because lithium batteries have reduced charging capacities cold (though I don't think it damages them permanently like heat does).
For all I know, 95% (roughly where you're at) is the expected amount once all factors are concerned I wouldn't worry too much. Maybe just get some comparative specs on MacRumors or with one of the utilities (some benchmark against everyone else iirc)
I have 46 cycle count, I keep it at my desk plugged in at 100% the vast majority of the time.
In your case, that'd be 8587/8790, or 97.7%.
There are a few apps out there that can do a better analysis too. CoconutBattery used to be a good one, no idea if it's still around, but they were common.