Is it harder to come up a new idea for a trading strategy or is it harder to actually implement the system to perform those trades?

Not being in that industry, to me it seems like the easiest part is coming up with a new trading idea. The hardest part would seem to be actually implementing it without bugs. Therefore, I'm not sure if noncompete clauses really provide a super-significant amount of value. Even if you left a firm with a super good trading strategy today and wanted to implement it elsewhere, you're still going to have to perfectly re-build it, which is probably not trivial.