Yes, having a set of codes that you can reuse in your programming is a real time saver over writing everything from scratch every time you need to create a new program package for "the boss". What I stated was that when I was a programmer, my boss[s] wanted all the code in one program and not have included modules of code. So you take all of your "procedures and functions" and place them inside the dingle file for the entire program. 20, 50, 100, 300, etc., pages of printout per program/package was the normal coding in my days as a mainframe programmer. COBOL was popular, though there were other better and worse languages that were used to do what was needed. Ever write a RPG II/III program? Worse to debug and modify. My first job was typing punch-cards and create paper-tape "program and data storage". That is really dating the types of equipment I had to deal with. I even did some Assembly module/routine coding with FORTRAN as the I/O for it.
Yes, having small code blocks that are easy to understand and reuse/modify is the key to the modern coding mindset and standards for doing things.
But, not all of us started out programming with that mindset as part of the programming skills taught in the educational and business environment. Now it is.
AS I stated earlier in this thread, I never got into learning and using Styles. I just never had the time or the "burning need" to do so. Then there is the compatibility issues of making a document with LO styles and then saving it as a .doc or .docx file format with MSO users taking that file[s] and modifying it and sending it back to you and your LO Writer to do more edits. I was told months and months ago that these styles would not "translate" well to MSO use and it would be better not to use styles at all for this type of cross platform and office suite editing. A great number of the documents I have created and edited over the past few years were for MSO users. I tend to stick with the .doc format [for text documents] so it is easier on the compatibility front between Writer and Word.
So using the "Underwood" type of mindset for modifying and "enhancing" a document, that will be edited by both Writer and Word users, may be better than dealing with Styles. So I have not really looked into using them in my work. Others seem to think that that style of work is too "old school", but it is not for many cases.
Yes, learning Styles would be a good idea, for those who have the time to do so. I have little time to learn in and keep up with the demands of my available time using a desktop or laptop. Half of my day seem to be me in a bed with a few pillows propping me up to see past my toes. That is the life of a guy with my back/neck/shoulder injuries. What time I can sit here and type these emails is a "gift" of my pain management routine. I have too much on my "plate" that takes up my time typing. Adding learning to use styles is not one of them. A new one was added by a police officer at my apartment "complex" asking me to monitor the computer center, 10 floors below my place, for illegal downloads, porn, and even the possibility of someone here using those computers for viewing child porn from overseas sources. When a police officer asks you to help with things like that, your answer should be yes.