Not really, time and time again people have abused their position/influence to build backdoors almost into everything for good or bad reasons. The whole idea of third party audits was to ensure that there are checks and balances. Then again the auditors are lowest paid to get stuff done and they take word of the company for most part.

On other hand its quite natural, security is not really getting you direct revenue so business is least motivated in investing it or say continuously investing in it. The ones that do are doing partial lip service for most part.