I haven't heard that.
Even so, a pair of good modern production EL84's (JJ's) only costs about 20 bucks. So, even if you replace them twice a year, that's still a small price to pay to have great tone.
Call me Wes.
Fender American Deluxe HSS Strat
Chicago Blues Box Roadhouse
Bad Cat Cougar 5
1957 Gibson GA-5
Ceriatone 18w TMB Combo
Hughes & Kettner Tube Factor
Various Ibanez TS9s
Weber MASS Attenuator