I have a genuine question here, I guess I could also ask Raymond as you both are pro's rather than hobbyists so have different expectations from your tools.
Im guessing that this has been your job for a while so how did you manage 10 yrs ago, as there must have been a noticeable improvement in AF since then? So if you think the A7RIV is bad now, you really must have had alot of frustration back then with the kit you had available to use? Did people just ignore AF and shoot manual for certain shots?
Or is it that as AF has improved, it has opened up new ways to shoot so the benchmark has gone up as you use a camera differently now because of the better technology? Shots you get now, you just wouldn't have bothered trying back then..
Or have expectations gone up with every new generation of camera? Are there long standing issues that manufacturers just never fix?
I know before my A7R2 I would upgrade just for the higher MP count, that seemed important for me, when actually 2 of my favourite pictures that I have taken were on a Canon G2 (4MP) and a Canon S90 (around 10MP), so my logic when I bought my Sony was flawed. I probably didn't even need a DSLR , a decent point and shoot would have probably done. However by then I had been sucked into the joys of photography forums and bitten by GAS

It was very hard at the time to resist the reviews for the a7R2, I suspect if I had the money now, Id have fallen for the A1 as I know it would have solved problems that I didn't even know I had until GAS kindly told me..
Even now I have an itch for a new camera early next year, don't need one, but it suddenly seems like the ideal way to celebrate my next big birthday.