Yes, unlike real software it has backward compatibility to the 80s.
Sometimes bugs appear only if you load three specific packages in a specific order. The fact that there are no namespaces and every package can modify everything makes it a complete nightmare. LaTeX would do well to take a hint from the lessons we learned in the past 40 years. Or just retire it and push something sane forward, like Typst.
Not LaTeX.
You'd of course need to read the documentation on what TeX and LaTeX are to understand this. Most people would rather write a new system.