well, it seems he may be doing only 4lo's and 4S's in his programs, I think his 3f is good enough to try 4f
Which jumps are included in his programs depends on the risk reward ratio of the jumps, the risk reward ratio of alternative jumps, not just the risk of injuries. The standard in today's competition is two quads SP and at least 3 quad LP (with 3 types of quads) if you want to win. If his 4t now has higher risk of injury, the risk reward ratio of 4t becomes lower than before. Whether he will replace 4t depends on if he can do other quads that have higher risk reward ratio. In the SP, he can replace 4t with 4lo because 4lo now has higher risk reward ratio than 4t (4lo has higher BV and decent consistency in practice now). But in the LP, if he needs 3 types of quads, then he can only replace 4t if the risk reward ratio of 4F or 4lz is higher than 4t. Doing 4f has a risk of getting edge deduction. It's not worth attempting it if he will get BV and GOE deduction. He has never landed 4lz in public. (It may just happen to be that he never landed 4lz when there were cameras filming him. But if in the few occasions that he was filmed and none of his 4lz attempts was successful, it also means the success rate of 4lz in practice isn't that high.) If he has extra time to practice 4F, he might as well use those extra time to practice 4lz and improve the consistency of 4lz because he doesn't risk getting edge calls when he does 4lz. (I don't think he would practice 4F if his 4lz success rate isn't very high yet.) Right now, it looks like he doesn't have better alternatives to replace 4t in the FS. Unless his 4lz becomes much more consistent than 4t, he will still jump 4t in the FS.
Many skaters still attempt the same risky jumps. e.g. quads, that had previously led to injures, and therefore get more injuries after doing the same jumps because they don't have any better alternative jumps to replace the risky jumps.
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ETA: If he does only 4s and 4lo in the FS, it will only be for the beginning of the season, not for the entire season.
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If there is no change of plans from Yuzuru/his team/JSF, we should be hearing/seeing something soon! Can't wait! 