It seems like the Moon's surface could be a fantastic place for an absurdly large optical telescope.
I don't see the advantage over just having the telescope in space. And there a numerous disadvantages: the moon's horizon will always obscure half of the sky, the surface will reflect light and pollute the imagery, fixing the base of the telescope means that you will only be able to focus on certain areas of the sky when the moon is in the right position etc.
and plentiful raw materials for making fused silica and aluminum surfaces.
There is a notable lack of aluminium smelters and robots to operate them - making the presence of those materials moot.
It seems to me that the best option would be put the telescope on a higher higher solar orbit than the earth. This way, you can get imagery (mostly) without light pollution and objects in the way. The main disadvantage is that should the telescope need repairing it might be a year or so before robots could be launched to repair it.