Why the developers/customers require layout with preprocessors or assemblers of webpac/Galp?

From time to time I see the adds on freelancing you need to finish a particular project on the preprocessors pug(why?) and sass/scss well, here it is clear there is a syntax for IE, as far as I know developers need to make yourself easier to do the project and it is more convenient for me, but the customer in fact need a website, not code. Enlighten me please)
March 29th 20 at 19:31
1 answer
March 29th 20 at 19:33
The customer need a website that will need to support

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