ON LKY and US, I feel consensus is US is geopolitically blessed and have all the institutions and instruments to preserve their primacy across many domains if they get their shit together. But also so blessed that it can coast along on current incompetence and past momentum fine for foreseeable future.
> count of publications
Refer to nature science index which collates from prominent western journals with contribution quality assessed by western experts. Or share of PRC science papers filtered/accepted through prestigious western academic conferences in variety of (STEM) domains. Or number of researchers in US/western R&D of PRC origin. There are many indicators that comport with dramatic increase in PRC science competence in recent years that shouldn't be dismissed as pressure to publich / gaming the system but PRC highered reforms finally paying off.
>immigration ... attract talent
I understand, my point is with the population denominator involved, PRC is generating more talent than US can attract. Quantity has a quality of it's own, meanwhile the proportion of quality among mass quantity is constantly being improved. I also think notion that US drawing from global talent is overstated, PRC is drawing from domestic population that accounts for 20% of global population, apart from fringe minorities, everyone in the system speaks Chinese. Meanwhile, US is realistically drawing from 13% of world that speaks English / has english fluency. One stat I recall is by 2030 PRC will have ~3.5/10 of global stem graduates, Indian ~3/10, US ~0.4/10, EU ~0.8/10. Gut guestimate is eligable pool of talent US can actually draw on is not substantially larger than PRC has domestically. That said, intuitively I do feel diversity of talent is important, but I can't really articulate why.
As for hunches on PRC lack of attractiveness for immigration, imo basically true but also misses the point. PRC incentives aren't structured around golden citizenship tickets, but good compensation + access to resources. Look at PRC poaching entire teams of TW and SKR semi engineers by paying them 3x market rate, and building SKR talent churches, basically bribing them with perks knowing full well these are get rich quick limited contract schemes. Or consider PRC thousand talent program with generous perks which work(ed?) pretty well at attracting foreign academic talent, strategically drawing "sea turtles" - Chinese diasphora scientists in premiere western institutions with all the language+culture reprequisits to work in PRC. Pay them lots, give them a well funded lab, it's an easy sell. Work(ed) because it's a tap western policies is attempting to turn off (US China Initiative, TW trying to ban semi talent from working in PRC due to national security). But it's not because PRC is "unattractive", PRC has money, money is very attractive. Ergo PRC geopolitical competitors need to draft literal legistlation to undermine/outlaw strategic talent from working in PRC. In TW's case because they literally can't afford to pay their semi talent well enough to compete with PRC money firehose.