Perhaps I can share something with you:
I met Lorne MacKillop here a couple of years ago when he was out in Australia promoting his malts. He had with him a small sample bottle of spirit caramel, which I was able to nose. The smell was sickly sweet, a bit like vanilla/caramel essence used in cooking.
I had a very generous dram of his Glenlivet poured, and I sampled it and assessed it clean first. I then, very carefully, added just the teeniest, tiniest drop of spirit caramel.
What can I say? The dram turned darker, and there was a significant and noticeable shift in flavour. To me, it tasted duller. Not sweeter, or more bitter....just dulled.
The lesson was not lost on me.