Unable to answer "Do these steps have a ramp? What kind?" – Steps – way/220541945 via StreetComplete 60.3:

There is no ramp, but there is an elevator

16 and 17 take separate paths, separated by a glass wall for about 10 meters, then splitting out.

Parklet here

via StreetComplete 61.1

Attached photo(s):
https://streetcomplete.app/p/285437.jpg

Unable to answer "Do these traffic lights have a tactile indication for blind people for when it’s safe to cross?" – Crossing With Pedestrian Signals – node/12122565971 via StreetComplete 61.2:

I've never understood what this means.

It looks like this may be mapped wrong. From satellite imagery I can see a left turn indication which suggests that you can legally turn left onto Blue Hill Avenue, but right now there's no real path to do that.

Additionally, it looks like you may be able to proceed legally straight onto Georgia Street, but probably should be verified by someone with local knowledge.

Shouldn't Bridge Street start from the intersection with Veterans of Foreign Wars Parkway?

This only have single lane traffic

via StreetComplete 53.3

Attached photo(s):
https://westnordost.de/p/165811.jpg

This bike lane continues up Ruggles Street

Is this a MassDOT lot? It's not listed at https://www.mass.gov/park-and-ride. Verify parking operator.