Sure? My point is, even if it impacted the CRT side of the divide, it would likely have not been a problem, because it would be a new version of the CRT with th

Sure? My point is, even if it impacted the CRT side of the divide, it would likely have not been a problem, because it would be a new version of the CRT with the breaking API and would not have affected existing code linking to the old CRT. And because libraries are generally more hygienic about not leaking CRT details across their own API boundaries, it would not have been a problem for old and new CRTs to be mixed in the same process.