I have cleared all of the content in D2, excluding CoS because of work..but Ill get it done. I have soloed ST multiple times, and soloed flawless the Other Side. I have cleared both Whisper and Outbreak missions. Can solo all NFs and all that. I do not like timers. Especially timers that end the activity at the end. I do not think it adds to any kind of fun at all. It only adds stress. It doesnt add tension and increase a sense of urgency. Examples of encounters I have really enjoyed are the ogre in ST and the NF. Nf has a timer, but it works differently. Difficulty and challenge can be acheived without timers.
No...they do not. Please. Timers aren't needed on everything, but on hard missions like zero hour they're perfect. And very doable.