3 semi long points and no tldr wtf am i doing
a) raze doesnt "break" timings whatever that means, she merely just has a slightly faster timing with her satchel boosts. this is something you have to deal with in cs too bc spawns can dictate rush timings heavily and people are able to counter this through good counter utility and being prepared earlier. hell, you dont even always see runboosts bc they work infrequently. back to raze though, ultimately this is no different from a jett dash as they'll be on about the same timing so in reality if you can read a jett's timing, you can definitely read raze. ppl at higher levels will be able to read either of their peeks since they are both delayed when fast peeking for a slight bit (raze bc midair, jett bc dash has delay unless she's ulting).
b) i personally believe all the duelists are a bit underwhelming, pheonix is the best one by far though since his ult is stupid strong (much better than raze's and especially jett's) and has much better tools for isolating 1v1s and removing multiple sightlines with his molly, firewall, and two flashes. raze can force people out of angles, and jett can isolate/block them off briefly, but neither can do both while pheonix can and more. pheonix embodies a duelist completely, while jett and raze are missing pieces (honestly for a duelist raze works suprisingly well in more of a 2nd entry role where she is looked at less)
ps: underwhelming =/= bad, just that i feel that they could do more
pps: also raze is worse on defense and require support from another teammate while pheonix will be mostly fine solo holding areas (i havent played enuff jett but i think she can stall out pushes long enuff for rotates to come in with her smokes, also she can do some crazy awping if she has her dash)
c) yes her ult is good, but i still think its underwhelming and even at the top level dying to her ult is less of a "omg shes stupid why can she do that" and more of a "i cant believe i got caught by that what a bad position i was in/why didnt i reposition upon seeing her and knowing she has ult" (honestly her ult is like a stronger version of her nade as in its much better at forcing someone out of position rather than outright killing, but it is still a great entry tool if raze decides to become a suicide bomber and most likely get traded)
this is my last nerd essay on this subject. raze isnt good and you cant change my mind.
(there are some fun sticky jumps u can do tho and they are funny when they do work)