The big question is why multiple coaches view him this way.
I'm pretty sure I've given my speculative answer for this before.
Coaches love Farrell - because he doesn't deviate from the gameplan, which means that if it goes wrong, it can't be Farrell's fault, and if the gameplan is inappropriate to what's happening on the pitch, it's not Farrell's fault.
If the playbook says that in this phase of play, in this quarter of the game, in this position on the pitch, the balkl is kicked high, to land 10m out from the R touchline, 23m out from the tryline; then that's what he'll do - 5 on 2 overlap with half the width of the pitch be damned!
The coaches see him making the decision he was told to; the fans see it being the wrong decision (and poorly executed even then)
He motivates, and he leads, and he never EVER makes a decision that the coach hasn't told him to make in that situation. Compared to that, the capacity to execute a skill under pressure is irrelevant*. Deviation from the game plan is a droppable offence for many coaches, and a severe bollocking if it comes off.
*ETA: And to be fair, his ability to execute a skill doesn't drop when the pressure is on - hence Test Match Animal - his ability to execute is never less than 7/10 (unfortunately, it's also never higher than 7/10)