Hey, great animation, amazing and inspiring.
Yes, every pose done with IK is achievable with FK. Though in many cases it increases amount of clicks.
I suppose there might be workflow that I overlooked to lessen number of clicks and IK isn't that essential
Ok, now I know what I was doing wrong.
For the first animation I chose spider with body and legs, idle. Animated body up and down and tried to rotate, translate legs accordingly. Problem was that I selected only one bone per time and transformations didn't affect parent bones which led to a lot of clicking. So... after seeing this part of tutorial Spine - Run animation tutorial - YouTube , and spending some time in Spine I stumbled upon that selecting multiple bones and using pose tool affects selected parent bones similar to IK, and is perfectly fine by me.
So I missed this part in tutorial and documentation :x.