- touch based screen/UI technologies,

- web 2.0 and later,

- widescreen ratios,

- every Google technology/product plus how Google handles them,

- the whole “smart” concept,

- x86 monopoly,

- web browser hell,

- personal systems with active cooling,

- instant messaging,

enough for a first comment.

But CRT to LCD transition was the hardest era until HiDPI + scaling comes to town (a.k.a. retina).