At one point, that may have been true, but more and more over the last decade executive decisions have been driven more by knee-jerk reactions from the playerbase rather than either focus groups or even calm discourse on Forums. Few companies have managed to do what Blizzard has accomplished in regards to player feedback, true, but the last 10 years have been a long string of companies scrambling to react to the consumer. This is in part, i think, because in the 'good old days' you couldn't really DO anything once a game was released, but now with the ability to patch, expand and generally tweak games well after launch, companies can actually react to the praise or condemnation of their communities. Admittedly, I have no links to the inside of the gaming industry, but i see far more reaction to the complaints, criticisms and praise of the playerbase now than anything i would consider the product of a focus groups input. Many companies have even started pushing the Open Beta model for online games, or sponsoring Lets Plays on Youtube in order to get this kind of input before release.
Admittedly not knowing him, and basing my knowledge of Todd Howard entirely from interviews and a few statements from people who either know him or have worked with him, i'm inclined to think he had more to do with the 11/11/11 release date than not. He strikes me as a very "It'd be cool if" sort of personality which is prone to that sort of gimmicky thinking. This can be great, but it can also be horribly detrimental (as we've seen recently with No Man's Sky).
I do tend to think that delays are almost universally from the Developer end, though... But i think it's rather important to note that there was a rather significant shift in how Bethesda engaged with the public following Oblivion. Skyrim was, apparently, mostly done when they gave it a release date, and we know that Fallout 4 was practically finished when they announced it. The greater degree of completion we've seen upon announcement is, of course, going to make delays less common, which makes it more difficult to gauge whose responsible for it.
I definitely do get a vibe that things are changing a bit. The mobile success of Fallout Shelter is definitely what spurred the Montreal Studio's genesis, and i highly doubt it was Mr. Howard that encouraged that. But overall, the lack of reaction to criticisms, general lack of media grandstanding, and continued unwillingness of Bethesda to match competitors in terms of development cycle and workforce don't scream 'Executive Involvement' to me. Unless, of course, Zenimax doesn't even want to be seen as a significant player in the industry, in which case i suppose they could be directly holding things back...
I definitely don't think this is on Bethesda's or Howard's radar, though. No Elder Scrolls game, or Fallout game under BGS's control, has eve been polished or perfect. At best, they're playable, and its a miracle they haven't been laughed off stage every time they've shown a game.
Ultimately, i see more in common with a Developer given too much freedom, like we saw with Daikatana, Duke Nukem Forever, and No Man's Sky, rather than executives being overbearing. Admittedly, Mr. Howard seems to be far more competent than those involved in said other projects.