Same here. I used to find Bluetooth a bit flaky, so it's a case of 'once bitten, twice shy'. These days though, depending upon the two devices, it can be pretty solid. However, Mr Rueger and myself can't be the only people who have some residual mistrust of BT's reliability.
For applications like smartwatches, where one needs to trust that notifications on a phone are passed on to a watch (or key fob, or headphones), reliability is crucial. 85%, to use your number, just isn't good enough.
My Huawei phone connects to my cheap Tesco BT speaker reliably, but my Sony phone refused to connect to a Ford Transit stereo on occasion. I've heard a lot of criticism of Smartwatches, but I haven't read of many complaints of patchy BT connection on the better known brands (i.e Samsung phone > Samsung watch, Apple > Apple, etc), so I get the impression that BT can be reliable these days if implemented properly.