There's this weird trend in online photography discussion groups where mediocre photographers embrace some sort of artificial limitation regime like "no cropping" or "primes only" because of the belief that it's purer photography or something. Like, I get that sometimes it might be a good idea to set a temporary artificial limit in order to break a bad habit but making those limits SOP is nonsense, imo. Knowing how to appropriately use all of the tools available to you is what makes you a better photographer, not arbitrarily throwing out some of the tools from the bag. See also "I don't use photoshop/shoot RAW, I get it right in camera" or "I don't need a flash, I prefer natural light"
Due to the rate at which I generate photo's, I'm trying to streamline my workflow - trying to frame the shot right first time is part of that, and accepting that parts of the subject may be cut off is a part of that too. Yes sometimes that leads to 'imperfect framing' but sometimes it also leads to interesting shots that I would not have framed that way if I weren't limited to a specific FOV.
So yes I agree the framing here is not 'perfect'. But 'perfect' can sometimes also be 'boring'. However, given the limitations I set on this instance I assure you that my technique is improving every time - I challenge you to get the same or better results with the same kit, only then you may imply I'm a 'mediocre' photographer. What I'm saying is that everyone has their own style, and if setting limitations is part of that, all the better. I sometimes like to use difficult equipment to steepen my learning curve.
FWIW with this setup you really don't want to crop too much (if at all) because the high iso's, mediocre optics and motion blur + imperfect alignment of the focal plane due to having to pre-focus manually, all lead to less effective resolution. So cropping to get the framing right means you may have to ditch the photo entirely due to poor residual resolution. A lot of these shots are framed rather tightly. For those that allow it, I will apply a little edge cropping if required. Like I said, this photo (and the entire series of that day) were shot using manual: iso, aperture, shutter speed, focus. No IS, no AF. Oh and FWIW the NEX-6 has an electronic viewfinder, so no OVF without time delay to help frame the shot either. Fortunately there's little shutter lag to speak of so at least that's a help.
Edit: for the attached shot, zooming was also out of the equation: Equipment used: Sony NEX-6, Metabones NEX-FD Speed booster, Canon FL 135mm f/2.5
. Manual everything (save the white balance). And no cropping