From the very beginning, this series started working with very limited material, limiter characteristics of every character, limited comedic materials, limited character building, minimal evolution and forced laugh track even when it is absolutely not funny in any possible way. With this kind of limited material they should not have been continued for 12 whole seasons and they are still keep going.
The most irritating part of this series is they are using recycled material over and over again to the point when it is not funny anymore. This series was created by the same creator of Two and a half men. For that series it was fresh until season 8 and it was solely dependent on sex comedy which worked for it fine. But for TBBT, the combination of sarcasm, sexual material and intelligence in comedy was not working at all. The result was, uncomfortable laugh track where nothing funny was found. Actually, why use laugh track at all? This series started in pretty modern era. Compared to other comedy series, this laugh track, studio set seemed outdated and in 2018 they are still doing that. They should have ended this series a long time ago where they still had that hype.