[zdimension]

> while offering real parsers (not treesitter)

Honest question, what's wrong with treesitters?

[exceptione]

Very short answer: because a treesitter will do an approximately correct parsing, while a hand written parser will do a correct parsing (and if not, it is a bug).

For a full, balanced overview, see: https://blog.jez.io/tree-sitter-limitations/