I have a TG5 and I've had the stock Olympus housing down to 50+ metres, and regularly past 30 metres, and it has yet to show any leaks. The other tech housings look nice but are probably overkill unless you're going to 60+ metres.
I do periodically rinse off and re-lube the main o ring, carefully so as not to stretch, twist or damage it, and I do stuff like submerge in fresh water after diving and press all the buttons to get the fresh water in there, then shake it out.
There is no shutter speed setting on my camera, but you can force it into a faster shutter speed range by turning down the exposure setting. This works great in conjunction with a good dive torch, or even ambient light video.
Also definitely learn how to use the manually calibrated white balance mode, for example go to your target depth, and do a white balance capture on the sand or something white/gray at the beginning of the dive. Sure, you could fix the white balance later in RAW or advanced video editors (e.g. Kdenlive), but it's way less work to just get your setting right at capture time, WiFi the catch onto your phone using the app, and gram away while the housing is still drying out with the camera safely inside.
You don't need frames, video lights or strobes. I'm getting great shots, whether lit up by hand torch, or macro, or ambient wide, both stills and video. Keep it small for travel, and as a tech diver I love being able to just put the whole bare camera+housing into a wetsuit/drysuit pocket so it's gone/safe/out of the way. No fussing around passing it down/up boats either.