Thanks for the quick reply! Went ahead and updated here:
changeset/169683450

Hi there, was there a reason you replaced what seemed like the relevant Bitter Lake Wikidata item (Q4919012) with a disambiguation one (Q878941)? Just wanted to double check before changing it back.

Whoops, my bad, thanks for fixing!

Hi there, this is currently the only "neighborhood" in Seattle tagged place=quarter right now, were you planning on adding/converting more to that level?

Also, Cascade has always had a very wishy-washy definition in my mind, so I'm not positive using the Seattle Department of Neighborhoods maps is necessarily the best tactic here (personally I would just map as a node).

I was not able to find anything in the Revised Code of Washington (RCW) to support there being a default nor do I believe the Seattle Municipal Code has any application here. I think the best we can do is leave the "maxspeed" tag off these sections. I could also see a case for tagging with the "maxspeed" of I-5 here since a vehicle would be traveling at that speed when entering or leaving the freeway. Hope that helps!

Hi there, I'm not sure the dataset you used for this changeset is accurate, there are no speed limits posted on these on/off ramps. Personally, I don't trust City of Seattle speed limit data as authoritative for state highways.

Just wanted to second what nickswalker said. Please use caution mapping things that are going to happen in the future as a user could easily misinterpret these and they do not reflect the "ground truth" best practice. Appreciate the work that went into these updates, but perhaps they can be made after the actual service change is implemented next time.