To this you've appended the hackneyed conflation between "speed" and "cowboy attitude". It's a common category error, but in truth, rapid iteration is one of the enablers of high quality and is a huge effectiveness multiplier for top shelf dev teams. Slow development merely enables lazy programmers (since it conceals their apathy) and gives us waterfall disasters. "Thoughtful execution" is possible in any context, and most thought processes are greatly enhanced by evidential techniques such as rapid prototyping / feature spiking.
Fast+incompetent = cowboy attitude, sure, but the problem there isn't the fast bit.