> Imagine I'd claim that since you're not using {X}
Usually on the third time someone recommends {X} I would have looked into it and formed my own conclusions with first hand experience.
Ok, don't forget looking into nrepl, so you can be as productive as me and others. That's the second time, now we just wait for the third for you to seriously consider it.
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> then you're probably leaving some workflow efficiency on the table
Typical HN to assume what the best workflow efficiency is, and that it mostly hinges on a specific technology usage :)
Imagine I'd claim that since you're not using nrepl and a repl connected to your editor, you're leaving some workflow efficiency on the table, even though I know nothing about your environment, context or even what language you program in usually.