Infinity X developer? If true, I'd say that team has a professional development and growth mindset problem, one symptom of which is a productivity problem.
Having expectations that any person should be able to teach what they can do to the rest of the team in a timely manner is unreasonable.
Problems like "Make X take less than Y time to run" or "Reduce binary size to Z" or "Design a fault tolerant system accomplishing Q" etc are often impossible for most to solve since they simple don't have enough foundations and intuition to solve them. You'd have to spend years drilling fundamentals to get people to that level if they are even capable of gaining the same intuition, most developers never gain those skills no matter how many years of experience they get.
Who says you have to be the one to do it? What conferences exist? What books? Online courses? You don't have to be the professor, but you do need to be their advisor and point them in the right direction to learn, grow, and thrive.
Sometimes there aren't conferences, books, or courses. There are lots of problems out there without solutions you can take courses for. Board bring up, performance, and lots of problems that fall into the bucket of "machine learning" require knowledge, cleverness, and lots of persistence.
There's also the set of problems that are best learned at universities. Normally, one doesn't have time for a developer to catch up on their missing compilers or cryptography class (this is particularly a problem since perhaps a quarter of programmers have CS degrees, and a quarter of them went to a decent program). If I were asked to debug a clock skew problem on a particular VHDL design, it would take me a long time to learn enough to even approach the problem.
Problems like "Make X take less than Y time to run" or "Reduce binary size to Z" or "Design a fault tolerant system accomplishing Q" etc are often impossible for most to solve since they simple don't have enough foundations and intuition to solve them. You'd have to spend years drilling fundamentals to get people to that level if they are even capable of gaining the same intuition, most developers never gain those skills no matter how many years of experience they get.