Well it was a statement made by an engineer that is renowned worldwide. You miss the fact that digital was a new technology. I think even professionals get challenged at times - why ther are problems to be solved in every profession., wether audio or medical or construction. Your statement assumes that professionals in an industry never have challenges to overcome. Listen to every recording of that era regardless if the genre...the early cds as well all treble heavy. But let's see what a professional audio engineer says not just us two forum debaters -take the time and research how the change from analog to digital and things like tape - reverbs - delays - and consoles being introduced challenged these professionals - it's well known among those who are familiar with mixing and the history of sound recording
Admittedly I wasn't a professional audio engineer in the 80's, but I was working professionally by the early 90's, and it was almost entirely analogue (except for samplers / sequencers / some outboard effects etc / and some aspects of mastering, such as editing / album sequencing) right up until the late 90's.
Hybrid sessions were pretty common on higher end projects, throughout the mid-90's, as Pro Tools gained traction (being the first complete hardware & integrated software solution you could buy with a credit card, rather than a bank loan), but even the TV, and movie industries were pretty slow to adopt digital workflows (it was a big deal when Band Of Brothers took the leap to work entirely in Pro Tools).
Dance records were mostly sequenced on an Atari, triggering digital synths and samplers, and routed through a mixer direct to either ADAT, or DAT - so, with the exception of the odd analogue synth, or effect, or live vocal, they
were mostly digital productions.
Things didn't go full "in the box" digital until almost a decade into the new millennium.
My point is, that digital didn't just happen overnight, and the challenges that are to be overcome, are overcome every day, on multiple fronts -
before the master is approved.
There are so many skilled ears throughout the chain, listening critically, that it's not realistic to say "the wrong EQ curve" was used, and nobody noticed, or made corrective adjustments.
Whether you think the early CD's had excessive treble or not, that was an aesthetic choice that was made to highlight the fidelity of the new medium.
Now, where there
was a learning curve with digital (and particularly early CD's) was the narrow dynamic range between the analogue noise floor, and full scale clipping ; that required careful attention with regards to summing, headroom, dynamic compression, and understanding dither noise. Those that hadn't got to grips with it, turned out some pretty harsh sounding digital masters.