Sure, if you want to supply energy using a star as a fusion reactor and if the laws of physics are as they currently are, and if you want to supply energy for billions of years to have a planet where liquid water can exist, then you should have a star of types type F, G, K.
But, considering that there is billions of such stars in our galaxy alone, is it not reasonable to say that if there is a purpose, they should ALL share the same purpose (they have the same structures and properties)? So any purpose the sun has should *at least* be shared with all other type G2 stars, right?
Now, given that many, if not most of those stars have no planets at all, the purpose cannot be to supply energy to planets, and so cannot be to support life. That says that any support for life is a side-effect even *if* there is a purpose.
Well, your statement that we can currently supply all of our energy needs through solar power is simply false for a number of reasons.
The total energy absorbed by all the planets and moons in our solar system is still a minuscule fraction of the total output of the sun. Well over 99.9999% of the energy from the sun just goes off into space, never to do anything else.
That depends on the goal, doesn't it? Why do you assume that life is a goal? And, as I pointed out before, any star similar to our sun would have the same gravity well and same energy output. Given all the shared properties, it looks like such stars, if they have a purpose, were mass produced and so have the same purpose. Since most do not have planets at all, that purpose cannot be simply to provide a gravity well for planets.
Why would you assume design? As opposed simply function?
Only if you assume purpose to begin with. Now ask (first* whether there is a purpose at all and how you cold tell.
Note that key word: **if**.
How do you know that? How do you know such 'interaction' could not be duplicated artificially?
Proof?
Proof? Objective evidence?
So don't assume your conclusion before you start.