I'm not sure if I really believe this, but I'm taking the devils advocate argument against it(science and tech being more advanced) since there seems to be a consensus in favour:
Consider that a lot of science and technology is "built on top of" previous scientific/technological advances. Depending on how much you buy into the deterministic theory of scientific advancement over the "great men" theory, this might suggest that a "broader base" would mostly mean duplication of theories and inventions, but only a very limited acceleration.
In fact I can see three semi-plausible arguments that it would be less advanced:
Firstly consider that the international scientific community has typically rallied behind a lingua franca/s(English today, although German played a big role in the past). If a more egalitarian present means a more egalitarian past, and therefore no lingua franca, then the international scientific community might be less international. Also consider that you'd see far fewer scientific geniuses emigrating to other countries(Tesla to America, for example)- so we might be looking at a greater number of scientific geniuses, but more diffuse so that they're fewer in number then they historically were in any of the scientific centers. This would be less of a concern in Modern OTL with internet and broad English fluency- but in the pre-internet era, and with broader linguistic diversity, it could lead to the whole being lesser then the sum of it's parts.
Secondly, consider nationalism. Science has often been perverted when it crosses paths with nationalism. See the German rejection of "Jewish physics" or the Russian rejection of antibiotics and insistence on Lysenkoism. Historically such bullshit hasn't been common outside of the Soviet Union and Nazi Germany, no doubt at least partly because scientific/tech progress has been concentrated in the more liberal-cosmopolitan parts of the world and because America ended up conquering/influencing most of the world. If however countries being wealthy and educated doesn't necessarily lead to liberalization and cosmopolitanism(I wouldn't have even considered that a decade ago, but looking at Russia, China and Turkey now...) and given the historical bastions of liberal cosmopolitanism(UK, France and America) are by definition less able to influence or conquer the world in this scenario... well, we might see more derailment of science by nationalistic dick-waving and ideological objections.
Thirdly(and this is sort of bullshit, given the "wealthy" stipulation in the OP), a wealthier Earth is likely to wreck it's environment more quickly. And since this is probably a world without hegemonic European imperialism derailing the regional conflicts outside of the West followed by the Cold War derailing regional conflicts in Europe, we might see a much broader distribution of WMD. Point being that Earth might have been crippled by an apocalyptic crisis decades ago even if it was at a higher point then OTL before that.
This was just a devils advocate before, but I've sort of convinced myself with my own argument. Now for someone to unconvince me