Another fairly serious issue with putting so much processing on the client side is that it can be much easier to hack - especially when no checking is done at the backend. I've successfully subverted login/security processes on 'modern' JAMstack sites way easier than would have been possible with a 'traditional' model. This isn't a problem with JAMstack per se, more an issue - again - with inexperienced developers not realising the flaws and vulnerabilities of the paradigm.
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Another fairly serious issue with putting so much processing on the client side is that it can be much easier to hack - especially when no checking is done at the backend. I've successfully subverted login/security processes on 'modern' JAMstack sites way easier than would have been possible with a 'traditional' model. This isn't a problem with JAMstack per se, more an issue - again - with inexperienced developers not realising the flaws and vulnerabilities of the paradigm.