I think the sealing on the Sony bodies, A6400 and A6600, is sufficient for quick or unplanned exposure to rain or splashes, with care taken to dry off as soon as possible vs just leaving the water there all day. My A6300 and A6600 have both been wet in rainshowers and spray from waves...but I do my best to protect them from heavy showers and dry them quickly if they get wet. Haven't had any issues yet.
Remember one key thing: none of these cameras from ANY manufacturer are warrantied or covered for water intrusion, no matter how much they may tout their sealing...and even the most weather-proofed camera can still end up getting water inside and going belly-up...even pro bodies and diving cameras. It just takes one older seal, one slightly crimped gasket, a tiny speck of sand in the gasket between camera and lens, etc. for water to hit just the wrong spot. And the manufacturer has no way to prove how you treated the camera - so if water is inside, it's not going to be covered by the warranty.
If you want to shoot in the rain, the simplest advice would be to just get a rain sleeve. I use them even on gear that has decent sealing...because why not? It's just additional security so you can shoot away and not worry...and that cheap $3 plastic rain sleeve will allow you to shoot in downpours, even hurricanes (yes, I've done that!).
Being in Florida, shooting in the rain is something you can encounter almost any day through the year - even if you weren't planning on shooting in the rain, a clear day can become a rainy one in minutes. Having the rain sleeve in a back pocket allows me to cover the camera and lens, and then continue to shoot through the rainshowers rather than stopping and running for cover...and I've done this with cameras that have some environmental sealing and cameras with none at all. Sometimes, if it's just a light rain, I'll keep shooting without the rain sleeve and just keep the camera under my shirt when walking around, pulling it out to take a shot...if it's really coming down, I'll just put the rain sleeve on - I've been able to shoot in the rain even with cameras and lenses with no sealing at all. Some rainy examples with lightly sealed and non sealed gear:
A long exposure taken on a tripod with the camera and lens in the rain sleeve and me just getting wet
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Justin
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