Why was the motorway tag removed?

Thank you for this update. I have also downgraded the section of North Gay Street to residential since it's no longer a through road.
Probably there are other class changes in the area that would make sense but I'll leave it for now.

Unlikely.
removed.
You'll need a verifiable source for something this disruptive.

St. Albert Trail being forced into the parking lot seems unlikely.
removed

access restrictions should be used instead.

Please use access restrictions on relevant ways instead.

"Maybe they also want to turn left?"
Ok go ask the bus if it wants to turn left.

Useless restrictions are't data. They're useless slop.

You're suggesting an undocumented unimplemented tag to map a situation that's already fully represented with access tags on the relevant ways?

Landuse shouldn't be attached to roads

So?
Are you claiming that bicycles can't go straight?

Busses can go straight or right. What's your point?

Unnecessary restrictions add no new information to the map and just make it harder to maintain if the situation ever changes.

Private/destination can't be tagged on restrictions so a restriction here is just fake data.

Pray tell where else the cars will go where access tags aren't sufficient.

The cars in the picture you shared did the maneuver you claim is illegal.
Any access restrictions can be tagged on the road itself.

This changeset added incorrect no_straight_on restriction disallowing through traffic on GA 83.
relation/12328207

My own curiosity:
If Amazon uses OSM for navigation how was this not found?
Was it maybe reported but mappers not knowing how to triage the issue?

relation/10631840 no_straight_on was accidentally added to Cynthiana Road disallowing through traffic.

Incorrect no_straight_on restriction
relation/18266820