Welcome to Anarchy, old-timer
Correct, that's what the table on Pg. 65 states.
If you really want the plot points before the extra attack, you could model an Amp after the Reaction Enhancers on Pg. 203 (in the Catalogue section).
I reckon it's a holdover from editing, but if your GM is cool with it by all means use it. I know I did
Not every character (or player) wants extra attacks after all.
The extra plot points also allow you (with "A dish best served cold") to make counterattacks outside of your turn which brings added tactical advantages. But yes, the extra attack will likely give back the most mileage. Which is why I think that the attack bonus makes up the first level of Wired Reflexes etc.
On a balance side, I can't really say I've noticed a problem with the Reaction Enhancements. *Narrow eyes at Agility-boosting Amps*
Feel free ask more questions or natter. There's a few helpful runners who have been happy to make the switch, and I usually pop in every evening (GMT).