What are you even saying?
TSMC is currently the most advanced chip manufacturer in the world. Apple, AMD, Mediatek, Intel - they all contract TSMC to manufacture chips. A process node can only do so much.
AMD is fabless and relies on TSMC for high performance chips. Intel has fallen behind and has contracted TSMC to make some of their chips. Qualcomm and Apple are both fabless as well and contract whoever gives them their preferred deal (in recent years Samsung and TSMC respectively).
The Mediatek chip in question is faster than the QC 750 by most metrics I could find but the QC 780 was faster in many areas. They're all based on ARM's off-the-shelf CPU core designs anyway but with their own uncore IP (and QC's own GPU IP among other things). You could argue that QC is better in that area but it's still a vast oversimplification if not outright wrong or misleading to say the stuff you're saying.
I have not seen any excessive clock speeds in any mobile processors. Some have clocked their GPUs too high to be efficient but that only results in poor battery life, throttling or both.
I'm not sure why I'm even replying to this obvious attempt at spreading misinformation. I guess other people shouldn't read this as being factual. You can criticize Mediatek for a lot of things but to include TSMC in the same sentence when they're partly responsible for enabling the success of Apple and AMD... That's just insanity.
Also, if TSMC are exaggerating their technological prowess (never mind the proof in the pudding) why do you want them to move their facilities elsewhere? Logically it wouldn't be of any interest to move or invest in inferior technology to secure supply. Fabs falling behind technologically is the reason we're down to 3 major players (TSMC, Intel and Samsung). We've yet to prop up all those who exited the race such as Globalfoundries who actually have facilities in the US and EU - and who actually had a working 7nm process that required investment to keep going.