It's not that the site is 'marketing speak', it's just that it's a 3/10 on communications.
Even two sentences at the top would help.
I've spent a minute on it and I'm not sure what it is.
It's a way to make apps, but it doesn't have a front end? I don't even know what that means.
It's accepted, it's respected, and it's even expected. Unfortunately, more often than not, it's also not at all appreciated by people from foreign cultures and we have to be really careful with our words.
There's a difference between 'what my instinct is' and 'thoughtful communication'.
It's possible in these kinds of situations that 'the plan is objectively dumb' and surely therefore someone might not be interested ... but I've seen more often than not people not really understand why something is initiated, what the objectives are etc. and just make narrow assumptions with belligerance, which they believe is 'being direct'. It's 'direct' in a way, in that it's a 'direct articulation of a narrow set of assumptions' - but that doesn't make it good or professional.
"This is dumb, I don't want to work on it" is surely direct, but it's also essentially an immature and unprofessional way of communicating.
More appropriately it would be: "I don't think this plan will achieve the understanding I have of the objectives for this, this and this reason, but here are some alterations that might work" - or "Technically, I don't think this will work because of this reason, but I don't understand what the non-technical objectives are so my feedback is limited to that scope" - or "I think these areas are more risky than implied, but these areas will work" or better "This won't work for these reasons, but fill us in on the strategic objectives and we can fill in the blanks with something that will, if we can".
I personally appreciate 'directness' a lot, but a lot of people misunderstand that to be 'what I think off the top of my head without trying to actually address the issue'.
And yest, there's way too much sensitivity around criticism going on. Legit criticism needs to be allowed. It's also really hard for some people to separate themselves form their critique or their work and so communications sometimes gets mangled on both sides.