Why librem 5 is so thick?

See the Community FAQ 1.2 (and maybe 1.9). Mostly because due to emphasis on free/open source software running on open hardware (instead of an integrated mobile SoC). See, for instance, Solving the first FSF RYF hurdle for the Librem 5 – Purism

Have also a peek at the several earlier threads related to this topic:

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