The thing that's new about Taptic is it is discrete and feels like a person tapping you on the wrist (Apple's words). No other smart watch I'm aware of has any sort of physical feedback, only beeps and alerts.
Perhaps you're thinking of some old Casio with an alarm?
EVERY smartwatch that I know of... even $30 Chinese clones... use vibrations to silently alert the wearer. Not beeps.
Some of them allow the user to modify the intensity and even the patterns, so that the user can immediately tell what kind of silent notification they're getting.
In fact, the silent alert is one of their early social downsides. A wearer will suddenly glance at their watch, for what seems to be no reason. Other people around them will often respond with, "Is there someplace you need to be?" because that's what glancing at a watch usually means. As more people own smartwatches or get used to them, this legacy reaction to watch glances will morph into something more modern.
We keep talking about "taptic" feedback like it's something new and never heard of before.
...
What I can determine is that "taptic engine" that apple is using is just Haptic feedback.
Yep, haptics are not new. For example, Samsung started integrating Immersion Technology's TouchSense haptic engine back in 2012 with the Galaxy S3:
"The Samsung Galaxy S III has finally arrived, and its got an advanced feature called Auto Haptic that uses vibration to create engaging physical response in downloaded 3rd party apps. With Auto Haptic, you can feel the sling stretch as you fling an angry bird and feel the impact of a grenade explosion in a first person shooter game..." Customizing the Samsung Galaxy S III’s Auto Haptic Feature
And
now uses it all over:
"Immersion Corporation (IMMR), the leading developer and licensor of touch feedback technology, today announced that the recently launched Samsung Galaxy S5, Samsung Gear 2, Samsung Gear 2 Neo and Samsung Gear Fit feature Immersion’s haptic technology, TouchSense® software. With a full range of tactile effects for various uses in each device, Samsung’s integration of TouchSense in the Galaxy S5 and Gear devices offer a more personalized and intuitive experience for the consumer."
Yet, I'm finding a real hard time finding anything regarding taptic feedback as a real thing. it sounds again, similar to the "retina" moniker. It's a name Apple is inventing to apply to something that is already fairly common.
Yes, Apple often invents a new name when they're not first at something.
Retina is a good example. The first "retina" smartphone was the Toshiba G900 (WVGA screen at 312 PPI) that came out about the same time as the first iPhone in mid 2007. Other "retina displays" that predate the 2010 iPhone 4 include the 2008 Sony Xperia X1 (312 PPI) and the 2009 Samsung Jet (301 PPI).
Of course, back then they were advertised as having "print quality" (300+DPI) screens. Since Apple didn't want to be seen as "not the first" at print quality, they came up with the alternative marketing name "retina" for the exact same thing.