"Innisfree, out is expensive" is a corollary to several other maxims such as, "pay me now, or pay me later" and perhaps "measure twice, cut once".
A few other examples.
Many years ago now, when personal computers were just making their way into the workplace (this of course tags me as a grey-haired old fart), a young co-worker came up to me and showed me a nicely formatted list of names and phone numbers, sorted by name, with borders around each name and phone number pair. I looked at her, and said, "that looks great--but what happens when you have to put a new name and phone number in the list?". She had manually sorted the list, typed it in, and manually formatted it with borders. "Oh," she said, with a crestfallen look on her face, "I'll have to redo the whole list". If she'd invested her time in learning how to use a database with reporting, or made the list less fancy, without borders, she could insert and sort much easier when needed.
More recently, I am somewhat abashed to say, my department has been using spreadsheets as databases. I'm actually ok with that, if done with the limitations of a spreadsheet kept in mind, and with some knowledge of database principles. The problem in this case is multiple items are being placed in a cell/field. This is being done because it's extra work to create multiple rows to hold the data being entered in the cells. Extra work at entry time, that is. "Pay me now or pay me later". When you want to extract a unique record for one of the items in a field with multiple entries, you can't, or you can't without a lot of extra work. The same is true if you use the color of a cell (red, yellow, green, for example) to indicate status--it will be difficult, if not impossible to sort by status unless you also include a text value for the field.
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