Both features were removed in 2019, the studio build is from 2020.
You can read about the change here: Part Surface Weld Changes [Activated!]
I’ve never had a surface hinge wheel break it’s plane of existence while driving, however I’ve seen wheels with constraint hinges morph under the map causing the car to be stuck forever.
I personally don’t think there is anything about constraints I’d call “less finicky” than surface welds.
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Again, this is nothing unique to constraints. Surface hinges and hinge constraints use the exact same physics solver with the same parameterization underneath.
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Surface Hinges tend to be stiffer and not easily fold on themselves like Constraint Hinges.
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Very unfortunate that now surfaces are hidden on all smooth objects. I loved to use hinges to identify front faces(only in studio), and studs/universal surface to help align things when building. This was a step in the wrong direction for me, I’ll have to code up a plugin just to regain the same functionality I had for years before.
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So. With the VehicleSeat, a property called AreHingesDetected exists, but I’ve discovered that it will no longer detect new surface hinges made. I believe it was working, on some previous update.
Could you specify what conditions are needed to make the VehicleSeat use new wheels?
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Pls add SurfaceParts back, I’m so used to using Surface parts, I don’t like to use hinge contrast (Unless it’s a door, a motor, a chain, or a buckle joint.)
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Now does this mean I cant create a normal roblox car (without code using vehicle seat) it was really easy to do than scripting a whole car
Maybe I can cut off a piece from an old car asset which has wheel connected to a part and I can scale that part to be small and use it on my builds
Yeah thats very smart
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Will, Surface parts be gone permanently!? I really hope not. 
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yeah I hope studs dont get removed I like them
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Wait, when u said yeah, does that mean SURFACE PARTS ARE REMOVED FOREVER!?!??!
No I said yeah to
This part
It would be so bad If they got removed
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