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.