Agree on all the above.
IMO if you spend the 15 seconds it takes to fully clear the pins, the area under the springs, and the fittings on the boots, you're G2G with 100% confidence and you know the clamps will only release when you start to tomahawk (assuming you haven't locked the toe that is). If you're in and out of your skis a lot though (patrolling/course prep/lots of short booters) it's easy to skip the cleaning part and then all bets are off.
A patroller buddy spent half a season on tech bindings because he refused to get a new pair of boots compatible with alpine bindings. He relented after 3 months of repeated pre-releases (usually right under the lift for maximum shame) and constant back and forth with warranty to replace chunks of his heel pieces.
Personally I have never had a Dynafit tech toe release that wasn't 100% due to user error (as you mentioned not cleaning the binding properly) or completely necessary (happens right as I start feeling like my knee is finally going to get it or because I hit a rock dead on at high speed). That's based on 10 years of touring with Vertical ST, Radical FT, Speed Turns 1 and 2, and Ultralites. I'm 175 lbs in the nude, probably 200 with gear, and I ski big skis with a style best described as angry charging moose. DIN is between 8 and 9. I only lock the toes in real no-fall zone or whenever I might flex the shit out of the skis (anywhere with compressions) and I hate it, I have visions of major DH falls on the WC circuit where the bindings never release due to the 20+ DIN and racers get tossed around until the ski itself breaks or they hit the nets. Having said that I've seen people come out of a tech binding at high speed for no reason whatsoever and I totally get the desire to lock the toes...
As for flippy lifters, fuck those things. As others have mentioned you can watch the Radical lifters flex at every step, it's not exactly confidence inspiring. I'll take the stripped-down metal volcano of the Speed Turns any day over those flimsy pieces of plastic. Takes a couple days to find the proper pole position to rotate without levering but the amount of force required to do actual damage is high enough that it's rarely an issue. The new crop of clamps is so over-engineered it has dozens of potential failure modes. The older versions weren't super sexy but at least they were sturdy and fool-proof...