Transistor densities increased 2 orders of magnitude (~100x) between 1995 and 2005. Integer operations were a little less, maybe 1.5 oom, over the same period. When you say that PCs stagnated over that period, in what context did you mean?
I think YouTube (and possibly Facebook) might be among the only other web services having significant qualitative impact on people's lives. Maybe Uber/Lyft for an American audience used to owning cars.
Also this: https://www.tnhh.net/posts/google-maps-insane-backward-compa...
There's definitely a sense in which the 90s marks the beginning of the era of the recognizably "modern" computer. The oldest computer you can run Linux on will be from the 90s. GUIs settled in the 90s - you can make a modern machine look like Windows 95 with nothing more than a desktop theme.
Maybe "matured" is a better word than "stagnated".