well, that's good to know about the 10R140, anyway.
The '140 is what is now used in the Tremor package (at least for my '25).
Knock on wood, but the 140 in my new truck works very well. I have over the years (used to drive all kinds of Super Duty trucks for work over the last 30 years) witnessed the evolution of these things. I do still prefer the six-speeds, such as the one behind my 400HP 5.0 Coyote in my F150, even WITH the "lead frame" issues affecting at least 1.5 million rigs (F150s, Mustangs, Transit vans). That fix is straightforward, anyway, and does not require transmission removal from the vee-hickle.
I am a transmission aficionado, and since the advent of the decent Manual interface for Ford transmissions have learned to use that in conjunction with the then-decent automatic shift mapping Ford had developed.
To the OP's point, these 10-speeds were to have been a joint effort between Ford and GM. That there are now three variants, those being the 10R80, 10R100 (the "G") and the 10R140 I no longer know which is done by whom.
That said, I use a combination of shifting for my 7.3 gas Tremor and it's 10R140 trans... I typically lock out 10, 9, 8, 7, and 6th to run around the neighborhood's 35 MPH zones as a 5-speed trans.
For 50 MPH zones, I lock out only 10, 9, and 8th to run as a 7-speed.
Regardless, whenever I want one more gear, it's ready to go at the +/- toggle.
Anyone who's ridden motorcycles and their sequential transmssions will know how to do this without a second thought.
Using M for Manual on the street will keep you very busy trying to anticipate the delay from the shift "call" to it's actual execution. It'd be sweet if that signal were faster processed, but I digress.