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Both the tools mentioned above LESS/SASS have been for 5+ years. There is churn in frontend tooling, but it is not a valid reason for not using LESS.

Usually this kind of attitude could be justified even if it was just a shitty anecdote, but with SCSS and LESS in particular I'm afraid you've chosen long lived, bulletproofed software that has tremendous adoption and community. Neither would be what anybody would call "the tool of the month".

If you're using React but not LESS or SASS then you have a strange attitude to "tool of the month" but it does explain antipathy towards DRY.

SASS is almost a decade old [0] and has been in wide-spread use for a long time. The tool churning you talk of is something I have only seen in JS land to such a degree.

Moreover, the barrier to entry to learning SCSS/LESS is really low if you know CSS.

[0] https://github.com/sass/sass/tree/4acf5158734013f08fca4be6e2...

Both are proven tools and should be used by any serious frontender. Pick SCSS, it's your most advanced option; you won't hit a limit in what you ultimately want to achieve.