This person seems to have greenspun themselves a JIT.
> It is difficult to get the boundary right between code which can and cannot be dynamically loaded. This is the same issue with using embedded dynamic scripting languages like Lua or Python—how much of your application should be written in them?
All of it.
> JIT compilation requires generating machine code, which is usually a complex process and a large maintenance burden. In practice this means shipping out to a 3rd party library for JIT, and the libraries are typically very large dependencies.
Is a c compiler not a large dependency and a maintenance burden?
> It is difficult to get the boundary right between code which can and cannot be dynamically loaded. This is the same issue with using embedded dynamic scripting languages like Lua or Python—how much of your application should be written in them?
All of it.
> JIT compilation requires generating machine code, which is usually a complex process and a large maintenance burden. In practice this means shipping out to a 3rd party library for JIT, and the libraries are typically very large dependencies.
Is a c compiler not a large dependency and a maintenance burden?