Yes, but the vast majority of the container being glass still has advantages. For example, whenever heating it, you'd remove the lid and only be heating the glass.

Yeah. At least the food usually isn't in contact with the lid though.

I would have assumed (probably incorrectly) that the 'seal' which would come in contact with the glass & liquids would be a type of silicone lid, while it could be considered a type of plastic, if its a good food grade lid, I would imagine it's a bit better ?

Ironically though silicone is much harder to recycle though.

You can buy glass bowls with glass lids.