You don't need to "prove" something when discussing aspects of game design that are self-evident.
What you're suggesting is like having someone criticise aspects of a movie and asking them for "proof" that the movie designers "intentionally" made those decisions. Of course they did, they made the movie. Asking for "proof" that the decisions were intentional is so ridiculous it's almost not worth me even replying to such a nonsensical request for "proof".
You're also missing the entire point of the criticism. When a game designer makes a bad decision that results in frustrating gameplay and that decision is criticized that's not the same as saying they intentionally wanted to frustrate players. It's more likely a result of it being easier for a game designer to take shortcuts and use artificially frustrating gameplay to substitute for a well-designed gameplay that provides a meaningful challenge.
There are many other examples of FD making similar design decisions in Elite, but if you need to ask for "proof" that they intentionally made those decisions you quite simply wouldn't understand the nature of the discussion.
You said that the SRV handling is due to a motivation to make it more challenging. Sorry but motivations are not self evident. Aslo, you said that materials gathering, synthisis, and engineering are locked behind the steep learning curve of the SRV. What of these specifically cannot be accomplished without the SRV?
"Steep learning curve"... lol
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