Remember that it's relative to what you're going to use it for.
From what I understand more top end tubesets tend to be stronger, which in turn allows them to be thinner, so manufacturers utilise this and make them thinner.
If your bike is going to spend most of its time in a shared hallway of a communal flat followed by being locked and knocked up on street furniture in the rain, then it stands to reason that thinner walls will be less durable.
Remember that it's relative to what you're going to use it for.
From what I understand more top end tubesets tend to be stronger, which in turn allows them to be thinner, so manufacturers utilise this and make them thinner.
If your bike is going to spend most of its time in a shared hallway of a communal flat followed by being locked and knocked up on street furniture in the rain, then it stands to reason that thinner walls will be less durable.