The Bitcoin Foundation in no way owns or controls the Bitcoin core implementation hosted at github.com/bitcoin. The Bitcoin Foundation currently sponsors some of the work there, since that is currently a good way to support the ecosystem— but this may not always be the case, and in the future the Bitcoin foundation may better spend its funds supporting the ecosystem in other ways (including other technical ways).

As such, I don't think the the bylaws should single this out.

I do not know if the BCF accepts restricted donations, some organizations do— some do not—  if they do then thats potentially a way you could better target your funds.  Additionally, there are other groups and indivigual developers working in the ecosystem who's work you could support directly and separately from the foundation. Increased diversity of support is good for the ecosystem and you may be able to support work which better aligns with your concerns and values than the initiatives currently being undertaken by the Bitcoin Foundation.

It may also be that some of the work you'd like to see done would best be accomplished outside of Bitcoin core— because the importance of the software is so high its a more challenging platform to experiment in. It can be easier to prove and refine an idea outside of it using other software on the network and then implement it back in Bitcoin Core once the design is clear.