Agree with all your points...
I just did my first oil change and got oil all over my floor from the splash (surprisingly a lot)...
Not sure if the order I did it had anything to do with the excessive splash.
I started with the engine oil plug(torx), then the transmission (allen), and then the filter although I forgot to remove the oil stick.
Also noticed the allen plug being excessively tight (I assume from the factory, since I think the previous owner never got to do an oil change).
The long side of my allen key was flexing a lot, my allen socket or the short side of the key would not fit all the way due to the brake spring being in the middle...
I got it out by using the short side and tapping it with a hammer, but I do not feel comfortable reusing it, so I was looking for better options.
I was hoping the valve in the link would help with the splashing and do away with the whole allen key thing....
I ordered it already, but after the responses here, I'm not sure I'm going to use it, especially being almost 50 bucks....
I think I may go with this one that I also ordered just in case..
https://www.amazon.com/dp/B09NWFCVXM?psc=1&ref=ppx_yo2ov_dt_b_product_details