The part I love about both Minecraft & Rising World is that you're given an open world to thrive in. No holding hands, no linear gameplay, just you & the world. What you do is up to you. How you achieve your goals, and how you go about it is your goal. That, and with games like 'Silent Hunter 3', American Truck Simulator, European Truck Simulator 2, & specific parts to 'Grand Theft Auto 3' up to 5 & Online. Your story is what you make of it, and how you build shows others your personality and character. I prefer survival over creative because a story can told, as well as something to be proud of also. There's so much to be proud of when you work your way up from a stone tool to an industrial power house. That, or just upgrading from a low-end something to a higher end something.
1) I find this a flaw in humans when I try to build structures to hold these research objects and such. The same when they try to exploit glitches & exploits. You need to encourage people to build stuff and to populate their structures with these furniture and such to encourage them to do such. Rising World & Minecraft have both, yet people decide to hide in a cave home because they play for short term, or they hate the thought of doing something so they hate survival. I've seen so much hate for survival that people simply come off as lazy & spoiled when they haven't thought ahead. Everything has to be handed to them.
2) Survival (or career) doesn't, yet it should be the main focus because it adds the actual meat & spices to the game. Something that gives the whole meaning to the whole game. Sadly, there's people either being outright lazy & spoiled, or simply don't have time. Luckily, Rising World is all freedom that you can do whatever you want, yet you still have to adapt to your terrain. You have to build up, survive, learn the traits of the entities to then build around them. Try co-existing with everything around you is what makes both this & Minecraft fun and rewarding. Sadly, again, people don't adapt to their scenery, nor do they think ahead on how to transport their valuables around. I've seen those constantly complaining failing to use common sense, throwing tantrums, thus missing various points. We're lucky Rising World gives us the same freedom as Minecraft, yet more. We're given more tools & such.
3) I can't say much about multiplayer because gamers are a spoiled & hostile bunch. I've been on a few servers on Minecraft with people being outright pricks. You have to be on a private server to really enjoy anything, or be lucky in finding that one 'pure' server. I've been pushed off of public servers that anything gameplay wise on there is simply left out to the vultures that I hide in online private servers with friends only. I can't blame the game because people are the worst part of it. Teching up also is what should be left to the player, also with a helping hand from others to tech up.
4) From what Rising World wants to do we shall indeed specialize in our field. It's been loosely done in Minecraft, heavily done in Wurm, and shall be a mix of both worlds in Rising World. There's various areas to tend to that we'll have to specialize in something. More so with the rumoured skill tree, and others.
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I'll have to get to the rest later, yet wanted to say that there's nothing wrong with starting from scratch again because you need to learn how the game plays. When you start the game up a few times to learn how to survive is fine. If it's when you rebuild with very important builds then I'll agree it becomes tiresome. You however becoime overly proficient at rebuilding your structures, as well as regaining your lost goods. Sadly, with lost books & whatever else we might have.
Once the game reaches it's more solid state everything shall be proper. We hopefully won't have to worry about world hoping, as much as in Minecraft', because of how much more common sense Rising World has thanks to Red51. I did find it highly irritating that leaving the game for a few months (or a year) did the job to regain interest in rebuilding in Minecraft. It just needs time to re-generate that curiosity. That, and proper friends.
You just need proper friends to make things fun.