When we use cameras we all have our own list of 'givens' .. things that we think are critical to our shoot process.
The OP must work out her 'givens' and that will lead to the correct choice.
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As for Canon being a mess - well to me a 'given' is the ability to have fine control of focus - that excludes IMO 90% of AF lenses.
At C300 money I would hope to rent proper cine glass for higher end jobs - not possible with the EF mount.
Another 'given' is when doing fast work is to have a zoom that can do a wide, a tight and a CU, 18-35-80
That option is only available in top end PL, or with a speed-booster and a 24-105 - EF mount allows neither. (or a 2/3 ENG lens and adapter - also not possible on EF)
So you refuse to use autofocus lenses and that dictates your camera choice over EVERY OTHER FACTOR, and yet the one lens you find acceptable is the 24-105mm L (a prosumer autofocus lens) with an adapter. Makes no sense.
That's all I needed to know.
To each his own.
Fwiw, I do see the lack of a PL mount as being obnoxious, but given that I haven't used a camera with a switchable mount (Red, F5, etc.) that actually has properly calibrated flange focal distance without obnoxious shimming (and can rent an Alexa when I want PL mount lenses) it's an easy choice for me personally. Obviously, as we can both agree on, that's different for each owner/op.