I did a LOT of research on this before my own visiting Japan whilst pregnant trip, and I agree.
There are a few caveats though.
Hot baths:
Tokyo does typically have much hotter sento and onsen then other parts of Japan. Historically it was to limit people's visits (the equivalent of sloping seats and mildly irritating music at fast food joints) and the high temperatures then became something folks got accustomed to. The larger super sento (like Oedo Onsen Monogatari and LaQua) will have cooler - cooler than 40/41C - baths.
I used information and data from Finland and Japan to help understand the actual (rather than perceived/assumed) risks.
Sushi/Sashimi:
Main concern was mercury and heavy metal levels, but this applied equally to cooked fish as to raw. So tuna, bonito, marlin, yellowtail, cod, (some of the squids if you are being very cautious) are perhaps best avoided, or eaten sparingly.
Again, I went on the information given to pregnant women in Japan for guidance on food I could eat in Japan. I ate a LOT of fish and shellfish when I was there, my father-in-law recommended wakame seaweed in particular.