The feedback/complaints I saw on social media was/were specifically and explicitly directed at how Dai's character Kakeru didn't feel like the main protagonist.
For an illustration, Shoma fans complained a lot about shows having poor visibility on the skating, despite getting front row / second row seats and paying premium tickets, and that it's obvious lottery winners are not getting the best seats of the ticket category despite making the effort to try win the tickets earlier before the general sales. What happened in Ice Brave is that those issues are completely addressed. Even the layout of the same venue are completely different between the show in 2024 and Ice Brave in 2025:
That kind of hospitality goes a long way. Japan still has the super convoluted manner of purchasing tickets, especially from overseas, although because Shoma choose paper tickets it's easy for foreigners to buy in person in Japan (7-11, Lawson) before the day of the show. But I think Shoma has the data of who made the most purchases and took care of the more urgent issues one by one, so that the price of the tickets, despite him charging normal prices, are worth it, both for his long time fans, and also for people who went to an ice show for the first time. If he decides he wants to continue Ice Brave, or if he agrees to be involved in the production of other ice shows as one of the producers, this will be the reputation that he brings.
One of the subtle things he did to make sure all sides are getting similar experience is through his own skating: his solo program Loco and Wild Side duet with Marin switch their front-facing directions in every alternating show, making both sides experience the program similarly. Of course he cannot do that for the whole show (but group / duet / trio numbers are arranged to have highlights in all sides) but it also helps the usual "back" side to experience more of the show, considering the way he set up the seating layout.
For someone who has way less core fans than other retired Japanese top skaters, I think he's making good use of the feedback and setting himself up as a producer who do pay attention on these details. And first impressions are really important.
____
On Marin, it's not just jealousy/ delusion, but many ongoing and persistent accusations over how she is a scheming woman who is only using him for skating jobs when there are many more capable skaters Shoma can skate with, and who lured him to the "entertainment world" with her wiles and making him have no passion for competition anymore, hence the retirement. Also for making him only do things with her, accusing them of being co-dependent.
Shoma knew what he was doing when he withheld the duet preview until pretty much the very last second before the show started, and he revealed he can do ice dance elements and 3A and 4T and 4T3T at the same time. The image of doing ice dance for some of his fans is still something a skater does when they can't jump (and therefore can't compete) anymore, which is obviously not the case with him. Some are still refusing to acknowledge any of his efforts even now- this is really the biggest difference with other fans and their favorite skaters, because I know some fans would kill to have their favorites be able to ice dance (with a height difference too!!!) and land quads. But because it's Marin...