going by the photo at https://www.sydneywater.com.au/SW/water-the-environment/what-we-re-doing/Heritage-search/heritage-detail/index.htm?heritageid=4570350 I'd still say that's a chimney, it's much larger than these smaller metal masts I mapped here.

however I'd still add:

tower:type ventilation_shaft

because it acts as a ventilation shaft,

I added

substance sewage

which is not entirely correct it's not like these shafts are spewing out sewerage, but connected to the sewage pipes and venting gasses so I think it make sense when combined with the fact it's a ventilation shaft.

https://osmlab.github.io/osm-deep-history/#/way/801462122 was deleted in this changeset, however it was added against the more recent maxar imagery and it looks like you're using the 10 year old imagery from 2010.

Next time before deleting or modifying it's wise to check who added it and under what circumstances it was added, and if it was using a more recent source than you.

So I've restored this deleted building now.

Hi there, I've made a note to do a ground survey here to check. As has already been mentioned, just because something is mapped in OSM doesn't mean it implies it's public access, many private access features are mapped as access=private. So it's only if the road has been removed that it should be deleted.

Since it's been a few days now I went in and fixed this in changeset/89621054

I'm interested, help to know how leafy an area is. Don't worry about the map being less readable, in my eyes OSM is a database not a map, if someone wants a map without trees, they can just exclude them from their style. Of course you don't need to map them, but they are welcome contribution.

actually I can just leave that empty eg https://hiking.waymarkedtrails.org/api/symbols?osmc:symbol=%3A%3A%3A%E2%89%88%3Alightblue for the two creeks track here

But osmc:symbol=* doesn't allow me to only specify the text and text colour. There is no way colour or background colour.

I'm not so interested in any particular downstream support right now, I just want to enter the data as correctly as possible for future downstream users.

yeah I just made that tag up now as a way to try tag a character that matches the route symbol.
symbol=* is a good one to use but since it's just a human readable description, it's not exactly the same as providing the exact character.
osmc:symbol is limited to a fixed set of symbols, where in many cases it's easier for both mapper and data consumers to use use an existing character symbol.

while it might not be needed for routing purposes since it's implied by the oneways, if it's signposted then it's not wrong to map it in my opinion

hi, I'd be surprised if this road segment had a speed limit, typically the 50 only starts once you turn off the main road onto the side road, so this road which is part of the intersection isn't signposted usually.

from what I can tell you added a whole bunch of existing roads as duplicates so I have reverted your changeset in changeset/89460516

reverted in changeset/89460447

hi you've deleted a road which was mapped as in construction which shows up on more recent imagery here based on 2013 aerial imagery, so I've reverted your change.

see osm.wiki/Good_practice#Don.27t_use_name_tag_to_describe_things

hi please see osm.wiki/Good_practice#Don.27t_use_name_tag_to_describe_things

I re tagged some of these as driveways

I've changed this to service=driveway as it's a better fit for roads which exist just to get from the main road to your house.

for the same reasons given at changeset/88828884 I've reinstated the deleted buildings.

I've re-instated the buildings you deleted here.

The imagery you've used here is from 2013, on the more recent satellite images the buildings are there which is where they were originally traced from. So if you're just deleting solely based on the NSW_LPI_Imagery, I'll revert that. Regardless since the fires went through here and we don't have post fire imagery we'll need to see if they survived or not.