I've never cracked a tile from drilling into at least 20 tiles. It's the FUD that makes people avoid screws in tiles.
Little bit of masking tape, low drill speed, decent tile / glass drill bits...you literally cannot go wrong. Besides which when you have you bathroom done, you keep spare tiles so worst case scenario is you pop the bust one off and replace.
That's too much faff for me - I just use a masonary drill bit.
My superhuman, or whatever it's called, telescopic shelf was delivered yesterday and I'm very happy with it.
It was a breeze to build and install. It's feels and looks like a quality item. My wife wasn't too happy when it was delivered as it's not the sort of thing she likes, or wanted for our bathroom. But once it was up and loaded, even she had to admit it looked ok and did the job.
£94 was a bit more than I wanted to spend, but looking at what's on the market it was a good choice price:quality wise.
I agree that if you're building a new bathroom from scratch it's not necessarily the sort of thing you'd specify; you'd perhaps go for a more elegant, bespoke solution. But for an existing bathroom, one you've inherited and don't have, or can get, spare tiles for, it's just the job.