The nature of engineering is such that, even with a G5 murderboat there's a fair amount of rock-paper-scissors involved, and with correct tactics a wide variety of ships will be able to escape. If you're dealing with a high alpha strike ganker, they'll open with a volley of PA/frags and possibly a ram. A well-timed boost lateral to their vector that causes that initial volley to miss likely buys you enough time to jump out. In contrast, if they've filled all their hardpoints with packhounds, you can buy that time by staying out of their target lock cone or using heatsinks etc to break target lock. I've survived even wing gank attempts in my Dolphin bubble taxi simply by being hard to hit.the manouver works onl against learner gankers that do not yet have a g5 murderboat
Of course if you're in a lightly armored T9 probably nothing can save you, because you just don't have the agility to evade anything that turns faster than a Cutter. Sacrificing some cargo to fill the small slots with HRPs and MRPs can help of course, but fundamentally flying a T9 is minmaxing for cargo capacity and you just need to use your judgement to decide when that makes sense.