As someone who knows the Swift 44 well, I think you guys are overeacting. The Raymarine issue may simply be a setting issue, as you can enable and disable the touch aspect. Smoke detectors are an easy add. The Volvo and Raymarine don't talk to one another as standard on the Swift. You need to get a Volvo NMEA 2000 Gateway which is around $400 I think. But again, nothing broken there, the boat just doesn't come with it as standard. Not sure about the inverter, could just be the way it operates. The lead ballast is no issue, as Beneteau adds it, maybe to level the boat I'm guessing? The 24 knots is right where the top speed should be, and the engines are hitting their absolute max operating rpm at 3,600. Not sure why the TV is not secured, but no big deal. Easy fix, maybe just a matter of securing a mount using a modern adhesive. Lots of Swift 44's have TVs in the Master, so the dealer should be able to provide guidance.
As for the bimini, clearly it was poorly constructed if it needs to be replaced, but certainly something that you can ask the seller to provide an allowance for in order to replace. Definitely not something that would lead me to passing on the boat.
Okay, that leaves 3 issues. The turbos, the rudder, and the caulking mold and mildew.
First let's talk about the caulking. Beneteau, for who knows what reason, insists on laying a thick bead of white caulking in certain areas, especially in the cockpit where the hull meets the top side. If you don't keep applying mold and mildew treatment periodically, especially in wetter climates, mold will grow on it and penetrate the caulking. When I purchased my Swift 44 up in Vancouver, there were areas where this happened. I doused it with a mold and mildew remover and after multiple applications the mold faded to where it is barely noticable. And at some point, I may just put a thin layer of caulk over it and eliminate it completely. I've even heard of people painting the caulk and swear by it as a solution. In any case, I do NOT agree with the way Beneteau uses caulk so liberally in certain areas, but that said, if you like the Swift, it is easily resolved.
That leaves the rudder seals and the turbos.
Let's cover the rudder seals. While obviously you'd rather not have a seal that leaks, as long as there isn't a lot of corrosion, this is an easy fix and something the buyer could ask the seller for an allowance to repair. Unfortunately, this is a known weak spot in the Swift. The rudder seals they use are not very robust. I had a leaky seal which was repaired after I purchased, and so far it hasn't leaked again. But regardless, I would consider the rudder seal as a weak spot. That said, this is something that happens on other Swifts. It isn't a sign that this particular boat is in a state of disrepair. And if you like the Swift, you need to accept the fact that at some point, you'll probably need to replace the seals. The parts are $120 per rudder, so when you get the boat hauled out for bottom paint every 3 years, probably a good idea to have the yard replace the seals.
That leaves the ONE issue that would give me pause, which is the turbos. The rest of the issues, especially since the caulking and rudder seals happen on other Swifts, are just noise in terms of making a "go" or "no go" decision.
The turbos should not have oil leaks at this point. My assumption is that they are under warranty, and if so, they can be fixed at no cost. However, if I was the buyer of the boat, this would be the one issue that I would put the majority of my energy into in order to determine if it is an isolated issue, or related to something more systemic. I personally have not heard of this issue as being common on the D4's. In general, everyone I've talked with said as long as you follow the maintenance schedule, they are very reliable engines. And there are a lot of them around.
So bottom line is that the turbos should be investigated more deeply, while I believe the other issues are very minor.
