Well for starters claiming that sim players jump away for free, hit at fullscreen, and teleport away for free when you get close implies that you don't really understand how dhalsim works, what you should be doing against the sim player, and what the sim player is trying to accomplish.
His stretchy arms and teleport are balancing aspects, to make up for the fact that up close he has ZERO defense. This is magnified by characters that specialize in offense (like one of them in your avatar, who is known to curbstomp dhalsim). Theoretically if a dhalsim gets to teleport away for free, than that is on the onus of the attacking player, and they messed up. Because not only are teleports punishable on reaction, it is something they should have been looking for. Its like making your way through sonic booms and then being mad that guile flashkicked you in the face.
Each stretchy limb has different properties, they are all specific pokes for where you are on the screen. Not every limb serves as an all purpose solution for damage. If you are repeatedly getting hit by limbs that means either a)The ways at which you want to get in are simplistic and can be stopped the same way every time or b)Your reactions after getting hit/blocking a limb do not change and can be read. Simplest one is getting hit by sim's stand fierce, your reaction is to jump....and you get hit by sim's stand roundhouse.
It is true that dhalsim does have matchups that are unfairly in his favor, but he also has matchups that are unfairly against him. Same goes for guile, vega, and all the "defensive" players. Their initial keepaway game is strong because they have limited options to escape pressure.
Its a bit like a racing game. Of course you gotta have the small fast cars that get destroyed when rammed, but there are also slower-accelerating cars with faster top speeds for people who wish to play that way. Their strengths and weaknesses are shifted, but they are there for people who want to play them like that. Shouldn't people be allowed to use any approach they want?
What a lot of people nowadays are wishing for is for the game to become
unbalanced for the sake of them being able to enjoy playing the way they wish to. It doesnt work like that (at least it didn't before, it may in the future).