There are only two current engineering dimensioning and drawing standard in the world and one is ASME Y14.5-2009. The other is ISO 1101-2017 and all the perspective country derivatives which are simply ISO 1101 translated into different languages.
If your organization is NOT requiring a dimensioning and tolerancing standard used on your engineering drawings this may not be an immediate problem depending on the complexity of the end item being detailed. Never the less, using a dimensioning and tolerancing standard like ASME Y14.5-2009 properly eliminates any potential confusion or miss interpretations by manufacturing, quality or even the next engineer or designer working the engineering drawing. Slang being used on a drawing can be a real problem just like if I chose to respond to you in deep southern regional slang.
As far as saving space on an engineering drawing, I’m not on board with your perceptions. Engineering drawings that are created “crowded” can cause unintended interpretation problems as well as extend the detailing effort in time trying to save space and paper. Printing a “C” or even a “D” or larger size engineering drawing is not expensive. Paper is cheap and time is expensive.
My experience has shown me that engineering drawings created that are easy to read and even allow manufacturing and quality to make notes on are engineering drawings that are more successful and subject to fewer missed details and interpretation problems. Moreover, crowded engineering drawings are challenging to check for errors and working to minimize space used takes the designer and or engineers eye off what is most important – which is fit, form, function and ease of use (drawing).
BTW, I consult and train ASME Y14.5-2009 and ISO1101-2017 standards. Am certified by ASME at the senior level since the year 1996
and have been too and reviewed engineering drawings from 100's of companies. see: https://www.engineersedge.com/GDT_Training.htm