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It's sounds like you've haven't taken many tyres to the limit since your technique appears to be lacking feel and feedback correction:
1. Drive down straight at 50mph
2. Slam on brakes down to 40mph
3. Crank over steering at 45-degrees
Then apply the same operation to any and all tyres. In which case, yes a tyre that has 39mph limit would slide while one with 41mph limit would still grip. However, that's not how riders brake and determine limits of their tyres.
Most riders are taught to roll on the brakes gradually and feel the tyre. When it starts to feel vague and maybe even squeal, back off slightly to be just below limit. That's the braking technique that gets you maximum performance from any tyre. Note that this technique is completely speed-independent. It works in the dry, it works in the rain, it works in the snow. It works regardless of type of tyre, street or race. Sensing feel and feedback and adjusting accordingly is vital rider skill.
Sticky track-oriented tyres do not give as much feedback as street tyres, millions of racers and trackday riders will tell you that. I'm just wondering where you got the data for your claims? How many days did you make it to the track last year? His many times did you lock up your tyres under braking and his many times did you slide your tyres under full-throttle around corners last year? Last 2-yrs? Last 10-yrs?
Braking has technique. If you grab a handful of brakes an lock up tyre, it's not the tyre's fault, you're well beyond limit of any tyre. The difference between old street tyres and sticky track tyres is only 5%, within atmospheric variations and rider's performance day-to-day. I've heard endless wannabe racers blame their tyres for their crashes, "cold tyres", " wrong pressure", "wrong compound", yadayada. Yet they had brand-new state-of-the-art tyres that pros use. Crash database from track day providers show that most crashes involve sticky DOT-R/race tyres.
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