The past of 2020 is somewhat divergent from our own. The War on Drugs went nuclear in 1993, the UK becomes a police state in 2003. The use of mass drivers, nuclear weapons, tailored bio-plagues and the like is common place by 2010 in corporate disputes, let alone national warfare, although by 2020 with most governments in the hands of the corps the only real war is a cold one between Europe (EU & Russia) and Turkey (backed by China). Of course, there’s three corporate wars prior to that (one taking place entirely on the net) and a fourth one at the end of the decade (though whether they stick to the 2020 scenario or incorporate the 203x stuff I dunno).
Hence I’d expect more external stuff, or implants, over complete replacements.
The only real complete replacements tend to be ex-military to replace limb loss. Although there is a small commercial market - one of the neat things about the Cyberpunk setting was that the limbs were modular and you could switch components out as necessary. A surgeon for example might get a shoulder implant capable of supporting two arms, then a range of limbs and hands which incorporated medical tools and equipment for work as well as a couple of limbs for recreation that he could swap in and out as necessary.
For the most part cybernetic implants are used sparingly precisely because of the risk of cyber-psychosis. For the majority it might be nothing more than a socket implant to allow them to connect to computers, smartguns and the like. Extensive modification is fairly rare outside of the military or specialised fields (those working in space for example might have vac-weave skin and eye implantation to allow them to work on the hull of a ship or space station without needing a protective suit).
There is verymuch room and scope in our biological systems too.
A lot of the cybertech implants could be replicated by biological ones instead. Although the end results were the same you had different advantages and disadvantages inherent in either (mechanical implants for example, apart from the risk of cyberpsychosis, were vulnerable to EMP weapons while a biological implant wasn’t, however biological implants could be affected by viruses, drugs and similar).
Also, “dodging bullets” is far from possible.
Not when one is capable of moving faster than a bullet