I think it's probably actually relevant, since it affects the roadmaps for those who develop Chrome Extensions.
If there's any intent to catch up to other tech companies who support mobile browsers (e.g., as Apple has done with mobile Safari), it would be useful for the ecosystem as a whole if Google expressed these plans.
For my own part in speculating, I suspect that at least a handful of engineers at Google "would like" to support mobile but probably is on a shoestring budget / minimal team (it doesn't seem that Extensions would directly contribute to Google revenue so it's probably a heavily-deprioritized team).