It is quite the opposite^^^Manual is more important outside because light is always changing..So adjusting it manually will be more accurate ...
Now for events, A-priority with exposure compensation is a norm...
The idea that manual exposure produces a more accurate result is incorrect. Whether the camera is configured manually or automatically the accuracy depends on how accurate the light meter is. The same light meter is used for manual exposure as for automatic exposure! In fact, the camera can autormatically read the meter and set exposure with finer granularity than can be done manually, though the difference is insignificant.
With either Manual Exposure mode or one of the auto modes the meter can be offset using some form of Exposure Compensation. It all works out to exactly the same
accuracy either way.
What might be different is either the ease with which an accurate setting is perceived or obtained and how quickly it is done. That might well be easier and faster using Manual Exposure mode for some people and might just as well be faster for some others using an Auto Exposure mode. (To be very honest, the only time Manual Exposure is faster or easier is when you
don't understand how to decide what is needed and set it!)
It is correct that straight Manual Exposure mode is more likely to be useful in the studio than not. Set once, and no change is needed unless the lighting is changed. Auto Exposure means making sure what you are measuring is the same every single time, and even a minor change in the framing of a scene will change what is measured. The result, for precise exposure, is tedious work unless Manual Exposure is used.
Outdoors however, the same might apply for some types of work, but the lighting is not totally under the control of the photographer and that "tedious work" is necessary for every significant time interval anyway.
It is pure nonsense when people make statements such as Shutter Priority is best 90% of the time, or the same about Aperture Priority or Manual Mode. That might well be true for their style, their talent, and/or their work. It will absolutely vary with different photographers.
The only valid way to approach which mode is to learn them all and be able to choose the right one and know how to use it. For example, some events might well work best using Aperture Priority because subject isolation is the most significant artistic effect for those particular images. That would be true if the subjects being photographed are not moving in a way that needs to be accounted for. Weddings, birthday parties, and other social events are examples. Sporting events are different, and Shutter Priority is commonly more important because subjects need to be "frozen" in just the right amount! Some motion blur, but not too much, requires a very specific shutter speed.
And often enough it is far better to let ISO float using AutoISO while the actual exposure (shutter speed and aperture) are
both set manually for artistic effect.
In any case, all of these exposure modes are only as accurate as the light meter. They are only as easy as how well they are understood. And each of them is best in some circumstances and not appropriate in others.
