As far as I understand it both forks have the same ledger, its only the transaction validation method thats changing. The PoS fork is mirroring all of the PoW transactions so no double spending or extra coins.
I don't think you understand how online businesses work. Social network companies like tumblr need advertiser dollars in order to pay for server and employee costs. Tumblr exists to generate revenue, user metrics mean revenue. If users aren't using the platform, advertisers stop paying as much and thus tumblr can't continue to exist.
Whether or not you like it now that porn is gone doesn't matter.
Why not buy a sofa second hand through a thrift store or charity shop? Costs tend to be lower and you can always donate it back when you're done with it.
That's the same with anything. How many endeavors have you thought "I'd love to do that but what if I got hurt in the process?" Relationships, startups, new jobs, everything contains a risk.
If it seems interesting, just do it. You'll thank yourself after you get over that fear. (Also buy a helmet and learn how to fall[1], you'll need it. Pads may be overkill but couldn't hurt.)
Have you heard of "kiting" before? Kiter seems like a great name in this context, having job prospects predictably chasing you rather than you hopelessly chasing them.
Have you read the memo yourself? I don't disagree that the post may be somewhat poorly presented, but it summarizes a large part of the memo in the one sentence it cites. The section "The impact of the proposed speech and the impact of its suppression" on pages 5 and 6 as well as the note on the bottom of page 5 of the memo are exactly what the main post is pointing out.