1. I don't get update nags now. DNS solves that problem, and I'd be using it even if I were on 11.4.
2. 99.9% - top keks. There are far more not running on 11.4 than you may realize. Not everyone trihards this shit to the point of keeping banners of their CFW in their signatures.
3. You're asking the wrong question. With the exception of online, what do YOU gain from 11.4 is the better one.
4. If 11.5 is released and breaks CFW, which while unlikely, is possible, I can continue to use CTR-HTTPWN when I need it and I continue as normal with no hassle, and no need to downgrade from 11.4 as a result. I already stated consistent online use as a "feature gained" in answer to the value proposition of 11.4, so if that's your use case, go nuts and upgrade.
5. Every single day? Lulz, not really, chief. CTR isn't really that much of a pain in the ass considering you only need to start the thing from cold boot or firm-launch. I think the last time this has happened to me was about 3 weeks ago - the last time I actually shut off my 3DS. But again, if you turn it off or reboot frequently, or are an O3DS user, once again, there's value proposition in 11.4 - thus, question answered again.
Look, we've clearly got a fundamental disagreement here that's been going on since the first time a guy updated his PC's BIOS without caring what was in the update. Some keep shit updated, and that's fine. Others update as necessary, that's also fine. But to say that updates are "necessary" is disingenuous at best - which is my point here. I think we can agree to disagree and get off our respective soapboxes at this point as the questions were asked and answered.