That's just it, there is a difference between what is claimed as "optimized" on these forums and "subpar", and there is an entire category in between--that of the normal character.
There is no such thing as a "normal" character, only normal for a campaign. If your teammates are optimized, you had better be as well. Nothing is more frustrating for everyone than having one character substantially weaker than the others, which is very likely to happen should any other character play a street sam, conjuration mage, rigger, ect. Basically, unaugmented adepts are less capable, on average, than the other archetypes.
I guess I just look at it like this, only the Face really needs close to 20 dice in anything (except soak, but that is quite possible for a great many characters). For everything else, 14 or 15 is plenty, and that can be attained by an adept without hamstringing your Magic with implants.
The desirable size of the dice pool is very campaign dependent, also note that you can buy cyberware and bioware to allow you to get a wider range of abilities rather than just to increase your effectiveness in 1 thing.
So it might mean that you're reasonable in ranged combat, the best in the party at melee and help your infiltration (muscle toner would help to do all that) while without augmentation you might be the best in the party at melee, poor at ranged combat and your infiltration is better than the troll heavy weapons specialist but...
It's fine to say that you'd rather adepts were purely focused on magic, it's not a good idea to say that you're sacrificing power in getting augmented because commonly you aren't and earlier comments you've made about any awakened character who has any augments being on the way of the burnout is clearly overselling things.