I can unpack some of this about glass (its long!)
There are two reasons primarily here about why glass is "hard" to recycle. Firstly, it's due to the coefficient of expansion (COE) that glass has. Most of our glass products (beer, wine, soft drink bottles) are manufactured in Soda Lime Glass aka Soft Glass, but soft glass has a COE range anywhere from 85 - 104. (Artistic glass from Murano is strictly 104, 96 or 90). The problem is that you can't mix COE's together when remelting glass, it makes the product unstable and prone to shattering. So our recycled glass bottles are *technically* recyclable but they need to be sorted for maximum efficient recycling. This is time consuming and expensive, as there is no actual way to know what the COE of a glass product is without testing it. The easiest way to sort is by colour because the colour is usually indicative of the type of COE in glass containers.
Unfortunately in Australia, there was never any incentive to keep glass products separate. Ideally we'd have a bucket system with 4 dividers. Brown glass, blue/green glass, clear glass, pyrex. Generally speaking, most beer bottles are around the same COE, as is most wine and clear jars. The problem comes when its all mixed together in a manufacturing facility. Pyrex is "Hard Glass" or Borosilicate glass and has a COE of 30, 33, its easier to recycle because there is less range. Float glass which is what windows and some chopping boards are made out of is also a different COE to other clear glass, so a broken window can't easily be recycled with bottles, but sometimes that gets mixed in. When that happens, that entire load of glass isn't suitable for a remelt, unless sorted.
Then you have the added problem of painted or plastic laminated glass (really particular to glass containers for alcohol and float glass), the paints and laminates have to be scrubbed clean before it can be recycled. Of course, its impossible for a regular consumer to get it off, so its left up to the recycling company, who put it in the too hard basket. Or worse, chip it and it gets mixed in with recyclable glass, ruining the glass that could be recycled.
Secondly, the raw materials for glass are astonishingly cheap and most of the raw material is mined in China (where most of our glass bottles are manufactured). There is little incentive to recycle glass when the raw material is abundant and cheap.
Like others here, I use a Bokashi bucket and I like making my own pickles, jams and candles, so I save glass jars (hoard more like). I have a soda stream so I don't buy plastic bottles, but my DH likes his beer and those bottles I can't reuse. I did cut them down to make little glass tealight holders a few years back but there is only so much amber glass tealight holders one can own. I always feel a sense of woe when all the recyclables are mixed together, just keeping aside amber glass on its own would guarantee almost 100% recycling of the beer bottle as beer bottles are usually around the 98 COE and really easy to reuse without melting down as well.
Anyhow, long winded discussion on glass, but it's a bugbear of mine. It could very easily be recycled if people were encouraged to separate it themselves.