Yes, I think we need to resist informality which is slowly taking over all aspects of life. i think it’s slovenly and leads to a dull attitude to everything. Informality has it’s place, of course, but it shouldn’t be ubiquitous.When I started karate (Okinawan), we began and ended class in seiza kneeling position, a short meditation to clear our minds, then bow towards the shomen (which was just a picture of founder Shimabuku on the wall) to show respect to all those who came before, then a mutual bow to the instructor. A year or two later this was simply done from a standing position. No attention was paid to foot angles or other prescriptions. Karate bowing as a whole was rather basic. (An exception was lima lama style (Polyniesian), whose formal salutation was practically a kata in itself.)
On the other end of the spectrum was iaido with its more formal, lengthy and technical execution. To me this is fitting as it seems to reflect the seriousness and emphasis of that art. From a practical standpoint, one must be in a proper frame of mind before swinging a deadly weapon around in proximity to others in class. I don't know about other traditional weapon arts.
I suspect most other arts' bowing lay somewhere in between these two examples. The important thing in TMA is the recognition and showing of respect and humility to those with whom you train, acknowledgement of those from whom the art descended, and the ideals the art represents. As long as the bow (or other action) reflects these things in the mind of the one doing it, mission accomplished.