This can't be understated.
My wife is a mid-tier firm attorney in (a field). Any contract generally has a low-level associate take a pass at the material, which she then scrutinizes, polishes, etc. and then shares with her supervising attorney, who also scrutinizes and polishes. This is then shared with the client, who has their own staff to scrutinize, who are relevant executives, content experts, and often in-house attorneys of their own.
Several iterations of this cycle are the bare minimum. Because this process involves low-tier associates being taught by upper level attorneys, the "basic" stuff that top experts take for granted gets scrutinized and explained, as well, so even the parts you think of as "stock components" are being carefully looked over and considered at length.
There isn't a single word in those contracts that hasn't been reviewed by at least a half-dozen experts.