yugutou Thank you for trying 4.3.09-beta so quickly! It seems that the Mix animations are not working as you described. We will fix this issue as soon as possible.

线与线之间的切换也很不方便，可以连一个线的时候另一个自动断掉之类的，可能会更方便？

This is actually something we're discussing within the Spine team, so we appreciate your feedback!
As you've probably noticed from trying it out, the current UI displays the sliders in the Mix section based on which transformations are connected. We designed it this way to keep the transform constraint properties as simple as possible. If all transforms were connected by default, a large number of mix sliders would immediately appear. To prevent this, we made it so that nothing is connected initially.

That said, manually connecting everything can be a hassle if you want all transforms to be linked. It would be better to have an easy way to do this all at once, so we will discuss possible solutions.

yugutou

或者把这个操作面板当成一个可以供开关的选项呢？

Hmmm, we will probably not take that approach. We often receive suggestions from users to provide an option to retain the previous version's behavior—not just for this transform constraint improvement, but for all kinds of improvements. However, we do not offer such options if we clearly believe the latest version is better.

While keeping the previous behavior as an option may be convenient for users who are already familiar with it, it can be confusing for new users.

We actually discussed whether to implement the transform constraint improvements as a separate new constraint. However, we ultimately decided to implement them as an enhancement to the existing transform constraint.
When we added the physics constraint in 4.2-beta, we ended up adding several buttons and features that were not there when we first added it. We plan to be similarly flexible with our improvements, so we hope you will continue to test these changes.

The mix problem has been fixed in 4.3.10-beta! Thanks for letting us know.

You don't need to drag each line, you can click one side of an empty connection to add a line straight across. It takes 6 clicks to affect all 6 properties. You should not connect properties unless you need them constrained, as it is more efficient.

Do you really need all 6 properties very often? I think most often users will only need to constraint 1-3 properties.

We could connect them all by default, but then you would need to disconnect the properties you don't want, which might take a couple more clicks if 1-3 properties is most common.

Thanks for showing your workflow!

It looks like you only need translate X and Y, so that would add 2 clicks to connect those lines. I don't see a way around this, as we can't know that you want translation.

Another approach could be to duplicate an existing constraint, then change the bones, but this probably doesn't save any clicks.

We'll give it some thought, but the extra work of connecting the properties is probably unavoidable.