Didn’t the whole bottleneck theory largely turn out to be BS? That is, that what appear to be obvious bottlnecks tend to have very quick workarounds?
Not entirely ... There was, rather, a problem with follow-up (or lack thereof). Eighth Air Force bombed the factories several times by day. Bomber Command (Harris) refused to carry out immediate follow-up raids on the same factories. The factories were quite robust in structure. The first wave of bombing was sufficient to damage the buildings and disrupt production, but not to destroy the machinery inside. A follow up raid would likely have destroyed, the machinery. Harris, however, thought killing Germans was more important than winning the war and preferred to bomb population centers.