First of all, congratulations @TokyoBoglehead
Secondly, I want to share my PR application story as well.
I have been in Japan on-and-off under Engineer/Specialist in humanities/International services visa since middle of 2015. And during this period, I was out of Japan for about 19 months. (longest period: 14 months, but the visa remained valid)
So, last year in December, I and my wife (both foreigners in Japan) applied for PR as a couple. My wife was the primary applicant as she had the higher salary at that time and Japanese uni degree (which didn't matter as my MBA counted as equivalent to her Japanese university graduate degree). So, we calculated our points, which was over 90 at that time
https://www.ro.emb-japan.go.jp/files/100500331.pdf
We were still unsure as both of us were in Japan for less than 10 years. Also I was in the middle of changing my job during the application, and there were uncertainties regarding the documents required due to my absence from Japan (work related)
So, we decided to use a Gyoseishoshi on contingency fee basis (pay only if successful). They did a check on our data and confirmed that we were eligible. We prepared the documents that they asked us to and submitted it to them. Applied in December 2022 to the Immigration Bureau.
Around late February, they asked me for my tax documents for the time when I was not in Japan. I was stationed at Singapore. So, I submitted tax documents from there.
And in mid-April, we were informed that our PR was approved.
In conclusion, I think it was a straight forward process. And in hindsight, may be we could have done it without the Gyoseishoshi too. But the sense of security was worth the
high price we were charged. (265,000 including the application fees for the two)