A spiral sequence would completely fulfill the requirements for a choreographic sequence. So the requirement has been removed, but the option has never been removed. Skaters just don't choose to do them.
It wouldn't work to have an option to do either a leveled element or an unleveled/choreographic element. In that case everyone would choose the choreo element so they don't have to worry about doing stuff just for levels.
Unless, of course, the leveled elements were worth more even if you don't achieve level 4.
Another option could be to have a choice of multiple different types of leveled elements. E.g., a leveled spiral sequence similar to what we saw in the 00s, a leveled field moves sequence (which could include spirals), a leveled low-revolution jump sequence, a leveled edge-and-turn element with different requirements from the current leveled step sequence (for seniors where leveled steps are still required in the FS). Or give the option of doing two leveled step sequences if you don't want to do one of the other types of elements.
Having lots of options for types of leveled elements and also for types of features that earn levels would give skaters more options and give audiences more variety in what we see as different skaters choose different options. I've been wanting this almost since the beginning of IJS.
But it would put a lot more burden on the tech panels to call dozens of different potential features across the different elements.
Instead the ISU is giving skaters freedom to do "choreographic" elements instead of leveled elements. There's lots of freedom there. But skaters aren't always creative in how they use the opportun