From my perspective, it isn't a question of whether or not a method is "frowned upon" or not: it is a question of whether or not it will achieve the desired result.
Is it possible to achieve a "quality" mirror gloss finish with a spray can? Sure.
Is it easier to achieve with a spray can than dedicated spray equipment? Maybe. The spray can eliminates the finisher's ability to control some variables that are involved in the application. That makes it "easier" since there are fewer things for the finisher to have to control. However, not being able to control some important aspects of the application can also make it more difficult, or diminish the quality of the result.
Regardless, the finisher still needs to prepare the pre-finished surface to be "perfect", the pores still need to be filled, the finish needs to be dead-level and then buffed. Those aspects don't change regardless of using a spray can versus dedicated equipment. Using a spray can might be a good choice for a first attempt since it eliminates some aspects of the application itself.
Keep in mind, depending upon the finishing material in the can, it is still flammable and requires adequate ventilation and respiratory protection.
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