JTTA hasn't fielded the pair of Ito-Hayata, it’s most successful WD team, since April’s WTTC. They’re not on the Swedish Op or the German Op either. What’s up ?
I'm not too worried about this. In my opinion, it has nothing to do with JTTA doubting the Hayata/Ito combination. JTTA knows that Hayata/Ito has been Japan's most successful WD pairing in recent history and the pairing doesn't have anything to prove anymore in terms of World Tour success. I don't think the World Tour Grand Finals doubles crown is that important to them given that both players have already won it twice. Both Ito and Hayata have won two World Tour Grand Finals Doubles titles (once together in 2018 and once with another partner: Ito/Hirano in 2014 and Hayata/Hamamoto in 2016). The only thing left for them to achieve is a WTTC gold medal, and their next chance is still in 2021. For now,
JTTA is focusing all efforts on the short-term, which is the 2020 Olympics. Women's doubles isn't a separate event, so it makes sense for JTTA to focus on Mixed Doubles first.
Ito mainly isn't playing Women's Doubles in the World Tour since they have to test her with different partners in Mixed Doubles. If she plays Women's Doubles in addition to XD and singles, she may suffer burnout, and her results in all 3 events would suffer, so it makes sense for her to focus on singles and XD for the short-term and give up WD for a while since the Olympics are approaching. For Hayata, she's focusing on Singles and XD too since she's already proven herself in Women's Doubles. There's no need for JTTA to continually field Ito/Hayata in the World Tour since JTTA already knows that this combination works and there's nothing further to test out. Besides, even if Ito/Hayata won doubles titles in the World Tour this year, the WR points from those wins can't be used for the 2021 World Champs since these points would have expired by then. Priority has to go to finding a XD pairing that works for the Olympics.
In fact, other countries have also been putting more focus on XD in preparation for the Olympics while the Women's Doubles of other countries are mainly for experimentation this year. HK has broken the Lee Ho Ching/Doo Hoi Kem pairing at times to test other pairings. Korea also did the same for their most successful pairing of Jeon/Yang. You can look at the Top of the World Tour Standings for Women's Doubles and see that most countries haven't fielded a stable and set pairing for Women's Doubles. Countries just aren't prioritizing Women's Doubles this year when Mixed Doubles is more important given the Olympics.
I suspect that after the Olympics in 2020, that's when Hayata/Ito will make a return on the World Tour in order to again build up WR points for a good seeding for the 2021 World Championships. That's the only thing left for the pair to accomplish and they'll definitely work hard again to accomplish it. However, that's not the main goal as of now with the Olympics coming up, so it makes sense for JTTA to focus efforts on the Olympics first before focusing on the 2021 World Championships.