Probably because everyone needs to make an academic career nowadays. To make an academic career you need to get published in prestigious journals or conferences

Probably because everyone needs to make an academic career nowadays. To make an academic career you need to get published in prestigious journals or conferences. These prestigious publishers are rather established and hence still stick to their ancient LaTeX template. In an ideal world, every publication would be more similar to a Git repository or a website that contains all the code for the statistical evaluations and, of course, the raw data that was collected initially The code would document why a certain sample was excluded etc. Of course, the results wouldn't be presented in dry tables or bar charts. There would be interactive visualizations that support the understanding of the data and results. All this would be integrated into the text. Of course, such a text would have real hyperlinks to other works without the need to go to a reference section and look up a publication. If a publication would fail to replicate, the original authors or their academic offspring would add a remark that this work is superseeded by some other work. Needless to say that all this has been proposed already in publications ironically in PDF. Also noteworthy that Berners-Lee proposed the WWW 35 years ago, which basically implements this.