Actually, LoadRunner has gotten a whole lot of continued development over the years, at least compared to all the other products. I did some protocol work on it, Diagnostics, and RUM, plus have had semi-regular contact with the R&D teams over the years.

Also -- you can not only run it on a single "server in the background" but to a whole slew of load generators if you like. You can take those same scripts and reuse them via BPM too. Even long in the tooth, it's still an impressive suite for its breadth of solution. JMeter, Selenium, etc really aren't in the same category as LoadRunner, and yes New Relic and AppDynamics are lovely, but give me Diagnostics any day.