Would you ever consider having letter spacing smoothing applied when animating the property? If you look at the animation It feels staggered towards the end if the animation is prolonged, I get it it's not a regular "animatable" property a weird request for sure as this property is meant for font editing but if there's a chance it would be nice.
I noticed if animation is shorter the staggering is less obvious as font pixel adjustment is quicker which means it's faster but it doesn't mean there is no stagger.
Hmmm, I feel like letter spacing used to only take integer values, but now it appears it can animate with fractional values just fine. I'll need to do a little testing on older browsers to make sure it won't break anything, but this will be a quick fix if there's no problems there.
You probably overlooked this as a property that can be animated in any event, I see this effect being abused by final cut users as its one of the premade 3d titles, here's another example of it being prolonged to 9 seconds you can see it wants to end me with that choppiness btw, notice the space that's generated after the letter T's because of the empty space its treated as part of a letter thereby it off centers the animation and I had to move the text bounding box to the left and it goes heywire with the bounding box size. - remove the left origin animation the box will go back to being normal looking.
I'm not sure what you mean, this is an animatable property. The issue is that we deliberately forced the numbers to be integer values and not fractional values for browser compatibility a while ago. Modern browsers now support fractional values.
What I did overlook was there was already a feature request from @MaxZieb long ago .
I'm not really sure I follow. I did a test of making it without the Origin (Left) animation, and I still don't see anything that seems off? (orange = no left animation, blue is with left animation). Maybe you can elaborate on what you mean or annotate some screen shots with what you see vs what you expect?
in any event, I see this effect being abused by final cut users as its one of the premade 3d titles, here's another example of it being prolonged to 9 seconds you can see it wants to end me with that choppiness 
btw, notice the space that's generated after the letter T's because of the empty space its treated as part of a letter thereby it off centers the animation and I had to move the text bounding box to the left and it goes heywire with the bounding box size. - remove the left origin animation the box will go back to being normal looking.
.
Didn't say you overlooked. 
Thanks for the breakdown though.
in the modern times