Honestly, I don't think that the thread should be any longer, and I wonder why it was so long either.
It is no secret that it is a niche, low-grade and mass production unit. Such units may have some strength, and also have clear weakness to draw the hatred. You can like or hate it, and no one can compel each of your individual taste, but no one can hide its truth either.
It is nothing wrong to say that it is a bad unit. But, as a unit with pack a (long)punch, it is also true that it is better than most other cheapshots, for it is expected to be shoot at least once or more before easily dying out. Do you really think that it would be worse than Hetzers? Well, I don't think so. Is it worse than Saladin? Maybe, but depend on the situation because of their different roles, and I think that Yellow Jacket surely have the upper hand for acquiring target at least, for its VTOL nature(able to move up/downside and can look down the others) and much longer range of the weapon.
So, at least it is playable and have some strength, if not that efficient, and you may weave some way to utilize it. Some ideas on the thread are actually viable. It is not that good always, and usually it ends up with prepare the formation optimized for for Yellow Jackets and you will wonder why you are bothred to do that. True. But, anyway it's cheap but have good firepower and range, and while it have a ton of flaws to gather the rightful hatred, but it is also true that it can draw the attention of someone that wants an exploitable niche unit.
Is it always useful? Not really. But is it good on the right situation? Yes, and that's why the choice is up to your situation or taste. If you want a bunch of cheap long sticks to stabbing the enemy on the long range, and you can make sure that you can keep it work then it would be your choice. However, if you are not bothred to a cunning(and risky) plan, or if you think that you(or your opponent) cannot keep it work, then it's not your one.
Just make sure that, it is not an optimized or reliable model, nor it is nothing but a trash for all situation. The plan for Yellow Jacket is required to shut down the enemy harrassers at all cost, and it is far from the reliable plan. And at least it have a functional long-range direct fire weapon, and not much weapons are able to fire back to it and it can sustain at least one hit against its expected enemy and survives.
And, remember that you can't make a new canon unit or modify the spec of the existed canon unit. All you can is make your own refit. It is easy to make a 'better' unit if you can make something of your own, but isn't most canon unit does as well? Personally I don't care for the canon design much(although I try to respect the design's original characteristics on the most times), but many of us are does.