One note: shooting at full power kills your flash, so if you often shoot m flash anyway w/o need for Canon's rt protocol maybe it's a good idea to buy a cheap Pixel flash... ruining the flash tube of a €500 flash seems like a waste of money if a €70 flash does the same thing.Interesting. Where did you read that? In a multi-decade career using flash almost daily, I've never heard this. On the contrary, underused flashes can have shorter lives, but then it's the capacitors that generally fail. Flashes that are stored unused for long periods should be "exercised" from time to time. Profoto used to advise that the big floor-pack flash packs be gradually built up through the power settings after prolonged storage rather than going straight to full-power pops.
I've had to replace three flash tubes and they were all resulting from drops. One was a brand new Profoto Compact 600 mono ( I was sad!) and twice with dropped 580EXII. They cost little over $100 each to repair at CPS.
What I have blown slightly more often is flash capacitors. My old Elinchrom 500 monos which didn't have cooling fans blew capacitors with alarming regularity. And I've blown a couple of Canon Speedlight capacitors, a 540-EZ and a 580-EX while working them far too hard on full power while hooked up to Quantum Turbo external battery packs. You just have to be a bit sensible when using gutsy external packs. Newer speedlights like to 600 EX-RT and Godox Witstro have overheat protection cutout functions. The $70 cheapies probably don't.
It's possible you may have been thinking about capacitors rather than tubes.