I would love to see them start giving out negative GOE for bad choreo sequences. I certainly saw some at Grand Prix de France that warranted some minus points, rather than positive ones. I won't single out the skater whose sequence really struck me as awful, since it's a fairly low-level skater
And yet, high enough level to have gotten a Grand Prix assignment.
(If it's the skater I think you mean, that skater did get 0.00, so not positive either, for the choreographic sequence.)
There are thousands of senior-level competitors around the world who will never get to compete at ISU championships or at the Grand Prix. Not to mention all the levels below senior.
So if you were watching these lower level skaters in the lower level events they do compete in, you would probably see more negative GOEs for choreo sequences. Now that junior free skates include choreo sequences instead of leveled step sequences, check out protocols from JGPs to see negative GOEs for a number of lower and sometimes middle-ranked junior competitors.
That said, the negative bullet points reductions on this element are:
Fall -5
Stumble -1 to -3
Does not correspond to the music -2 to -4
Loss of control/Lack of energy -1 to -3
Lack of connection between choreographic movements -2 to -3
Poor quality of movements -1 to -3
Lack of creativity -1 to -3
Some of issues you will see from GP- or Challenger-level skaters if they are using the choreo sequence more as a rest break than as an opportunity to sell individual skills and choreography.
And even the best elite skaters might occasionally happen to fall or stumble in a choreo sequence. But those best skaters probably have positive bullet points for other parts of the sequence, which could cancel out any negatives from a moderate stumble or lack of control.
Currently in the choreo sequence (base value 3.0), the value of the positive and negative GOEs are 0.5 for each plus or minus, so more than the 10% per plus or minus for other types of elements.
If a skater were to earn -5 GOE for the sequence they would end up with 0.5 points total, way less than half the base value. If there's a fall, the net result to the total score would be negative.
And straight +5s would give the skater 3.0 + 2.5 for a total of 5.5 for the element.
However, if the ISU really wants to encourage skaters to invest in the creativity and performance/execution qualities of this element, they could make the positive GOEs worth even more, 0.6 or even 1.0 per GOE point, so that the final value of a really exceptional choreo sequence could be as much as 6.0 or 8.0 points total (as much as a just-adequate 3Lz or 3A).