So you're saying his renders are getting better every year? Because otherwise it wouldn't make sense that things are getting slower year after year. And with that said, you might wanna check out renders from ~3 years ago.
Oh, and while you're at it you might wanna check out the overall amount of renders produced every year aswell and then tell me it's completely normal that this number is going down by roughly 30% every year.
Also this;
View attachment 3738724
Hint: If you think L&P's render quality has gotten any better the past 2-3 years, that's only due to a tool called Topaz Labs which enhances images using AI as well as a much more powerful rig. None of this affects development time. Sorry, let me rephrase this. Development should actually become faster with more powerful hardware and years of experience working with the same tools.