Your node is primarily useful to verify your transactions and to transmit your transactions. If all you're doing is transacting on chain, there's not a ton of reason not to prune. A lot of people think nodes are ballots. Those people are going to slam into reality in 1 month and 4 days. Archival nodes are required for some applications though. And yes, they are more helpful in letting new nodes bootstrap. Also, miners don't matter unless they're generating blocks.

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BIP-110 mandatory signalling block height hits in the early morning. And is expected to cause a lot of very loud people to suddenly find out that they're no longer Bitcoiners.
Wait they're trying to fork? Like hard fork? I'm not following. I don't understand your use of "signaling".
They're doing a soft fork. But it's a minority soft fork and they're right now getting less than 1% of blocks per signaling period. If they get 51% of the hashrate they can pull Bitcoin along with their 'upgrade.' Otherwise their chain splits off because they throw away the blocks in the heaviest chain due to the rules of their BIP. Some do seem to not recognize this is how soft forks work believing that only hard forks cause chainsplits. So indeed some will be quite surprised. Others just believe that miners will have an 11th hour capitulation to avoid having blocks thrown out. But as far as I can tell miners couldn't care less about these non-merchant (aka non-economic) nodes.