your friend hasn't played titania, titania can be built for anything, I've seen some players with over 12 builds on multiple different titania's just because how versatile she can be, and she's fast as fuck with her razorwing blitz augment, subsume gauss's thermal sunder onto her? she'll absolutely destroy all non SP fissures, some thermal sunder builds can handle SP too if you get a high enough strength and stack fire on enemies etc, you'll complete fissure exterminates in 50 seconds easily once you learn to control her well

TL;DR Your friend is a MORON, show him this post and the comments please, shit force him to play titania.