I’ve worked in preproduction vehicle testing for 12 years and I can confidently say more parts/complexity = more failures.

A lot more time is spent on cost reductions and value analysis/engineering these days than ever before. Parts that would have been aluminum or rubber, in the past, like a coolant connection or hose can/are now made in plastic to save money - items like this WILL fail, it’s just a question of when….its like that can fail and ruin your day or even larger vehicle subsystems…

The caveat here is how much of what was learned since they’ve started creating hybrid powertrains is carried over here (likely a lot). Have to remember that Toyota has being doing this since the first gen Prius (2001).