Nice video, lots of good info provided. After answering lots of questions from people on equipment on the forums it's clear to me as mentioned at the end it's important to look at the the choice from a total system viewpoint, many people have posted here asking if they can use a certain wet lens or if a suitable port is available for a lens they are interested in only to be disappointed that it can't be done. For each housing/camera system you might be interested in find the port charts and look through them to see what lenses are supported and check the fine print for any limitations.
Equally lots of people are keen to house a camera they love to use on land - often this is not their best choice once you look at the limitations that camera might impose or the cost to house it - or it's a camera with very limited support in housings.
Lastly cheap housings are often cheap for a reason and often don't have the wide support of lenses, don't do the work to optimise port placement or offer one size fits all solutions. This is not necessarily the wrong choice, but do your homework so that you understand the limitations that system imposes.