I don't see how RAM or CPU are negatively affected. I don't see how it costs more energy either. Inscriptions have fewer signature operations per data than other transactions. And nodes that filter their mempool still get the whole block, only marginally reducing bandwidth use. So, I don't see why filtering is helpful for any of those four concerns.
Again, I don't like inscriptions, never held any, think they're stupid. I work on Bitcoin the money.
I don't think your preferred remedy helps in any interesting way and it's itself potentially harmful
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