Did you ask Hypex about warranty or is this just your opinion? I asked about mods and they clearly stated they would void warranty.
Hypex use of RTV to reduce shock and vibration issues is by design. So would be part of the testing they do. While acknowledging your suggestion to test first, not everyone has a good thermal camera. A pair of scissors is much more accessible.
I have had these discussions with Hypex and it would be relevant. It could also be relevant to the manufacturer as the modules are warrantied by Hypex to them. I considered becoming an authorized Hypex repairer and my understanding is Hypex would honor their warranty regardless. No buck passing as you allude.
One camera angle on one case design is hardly a major problem. I have other cases and the LED brightness is not a major concern. Am sure Buckeye or his customers are smart enough to employ simple mitigations if needed.