I think part of the reason the OP is getting a lot of responses that he considers not on topic is because he essentially made a single point: that rogues should not have a clunky mechanic for optimizing their SA, and then befuddled it with contentions that rogues are not proper glass cannons.
These are two entirely different points requiring two entirely different arguments, and so I don't think the OP should fault responders for responding to one and not the other.
I will respond to both.
With regard to the glass cannon issue: my sense is that the OP wants rogues to fill the glass cannon niche found in MMOs...they do the most DPS but are also quite vulnerable. From his point of view, rogues in 5e are not glass cannons, they are glass rifles or glass pistols. In other words, their damage output does not justify their lack of tankiness.
My response would be, as others have said, the rogue is not designed to be the MMO glass cannon in 5e. 5e is supposed to, ostensibly, support all 3 pillars of play equally, and that means the rogue shines in other areas aside from combat. IMO, a rogue that can contribute meaningfully to DPS, who can use tactics to remain out of harm's way (and they have PLENTY of tools to do so), and who excels in the noncombat pillars is a well designed class.
With regard to your second contention, that forcing rogues to utilize OA and other clunky exploits to maximize SA's per combat round (not turn) is bad, that may be more valid, IMO. I am not too comfortable with mechanics that exist just for mechanics sake. Why would a rogue under a haste spell get 3 SA a round if he readies an action but 2 per round if he makes both of his attacks on his turn? Seems counterintuitive to me!
I'd rather see a rule as follows:
A rogue gains 2 sneak attacks at the start of each of its turns. Each sneak attack can be used once per action, bonus action, or reaction where it makes an attack roll with a qualifying weapon under qualifying circumstances.
That would seem to cover it. A two weapon rogue could use his action to SA with his on hand and his bonus action to SA with his offhand. A one weapon rogue could get an SA during his attack action and an SA during an OA.
