The reason one goes to a professional is because they know how to make proper insertions, and make good settings to work on the skin and hair you have.
Perfect electrolysis has no difference in kill rate between Galvanic, Blend and Thermolysis. On the other hand, one is less likely to make mistakes for long in Galvanic, because it is so slow that one would surely make changes before making the same mistake repeatedly. In blend, the same process happens faster, but still not so quickly as to make one miss something bad happening, and the current may help one on a difficult insertion.
Since the chemical reaction created in Galvanic and Blend are what treat the follicle, the follicle ends up treating itself, and insertion skill is less of an issue to a treatment that obtains the desired goal to kill the hair. On the other hand, Thermolysis is so fast that when you make a mistake, you have no way of knowing until you have completed the mistake. There is no lead time. There is no developing problem before your eyes. Lastly, if the insertion is not done correctly, one will mistreat, or undertreat the follicle, causing the hair to not be killed, or scarring.
So in conclusion, Thermolysis only has a lower kill rate when compared to Galvanic and Blend from the standpoint that skill of operator plays a larger role in efficacy of treatment. This is why good thermolysis by a competent practitioner is cheaper than either Blend or Galvanic on areas larger than an upper lip because one can get to first clearance quickly and go directly to maintenance phase.