Perhaps of interest:
https://www.nwyachting.com/oceangate-prepares-for-titanic-dive/
Ocean Industry
There are reports that they did a lot of testing and analysis.
Including unmanned submersions at great depths, instrumented with their hull monitoring system.
There are reports that a variety of labs were engaged to help them test.
There are reports that after one manned dive, they may have retired a capsule and did analysis which required destruction.
There are reports of at least one other sub made with CF that was developed over time by experienced people (at HOT) and that the Titan perhaps leveraged learnings from that effort as did apparently some of their subcontractors.
Much has been said about dissimilar materials, yet we know there are deep subs made from acrylic and at least one famous unit was made of ceramic.
And this famous sub was tube shaped and had ti end caps and metal flanges.
And these were glued on. I provided some links to related technical info on this sub.
It imploded. Lots of info on that famous sub and its loss.
Depths greater than 4k feet I reckon.
I have not found any info on the Titan's hull monitoring system except what was published by a reporter at a link I provided previously-- an article by a reporter that interviewed Mr. Rush. Mr. Rush's description is far from a technical presentation, but it does suggest some thought was applied and testing was done.
I suspect that the hull monitoring system was protected by IP so perhaps there is some info in the public on that.
Perhaps in the literature as well, although I have not found any.
We may find out that the implosion had nothing to do with carbon fiber, ti flanges, hull monitoring, construction, porthole specs, et cetera.
We may find out that it was some typical item that is used in many subs.
Let's see what can be learned.
And yes, ventilators are very complex medical devices.