We've got the following:
The 5% rule: they don't want to change the total number of outstanding shares by more than 5% lest it be mistaken for a "business combination." If it's a business combination, a 2/3 majority of disinterested voting shareholders is required. Otherwise, it's just a majority of each class.
They're relinquishing majority control, but they guard against takeover by proposing to stagger the board, require cause for removal, and require a supermajority for amendment of the charter or bylaws. To pass those provisions, a majority of Class B is required.
There's a provision allowing a third party to block the recapitalization by offering more than $46,62. Mason tries this, by offering $55/share. Kamen re-titles the the thing as a "substitute recapitalization" and offers $55.65. But they don't have that kind of money (b-to-a is now 1:3.58 or 1:1.84 + $27.10), so they'll have to take on debt. Basically, in order to avoid the 5% rule, they'll need to go with the lower ratio plus cash, but they don't have the cash to pay the Kamen family so they need a loan.
So the vote happens with a simple majority: the Bs pass it, and the As do as well, so the shareholders must have thought it was a good idea.
The supermajority requirement for business combinations is there to protect the minority interest from a buyer who purchases control at a slight premium and then buys out the minorities at a reduced price; or even refuses to do so (i.e., only the first sellers make a profit).
Sometimes it's desirable to go find additional shareholders with deeper pockets, and you want to be able to attract them by offering larger shares in the company. Preemptive rights limit a corporation's ability to do this.
Sometimes just one investor will negotiate for preemptive rights.
In the absence of a preemption agreement, the board is free to decide to whom to issue the shares.
But note that no petition for dissolution was filed, but the court decides it can dissolve it anyway. Retroactively.
Let's assume that the founders and the investors each have 3 board members, and there are 3 more elected by all the shareholders.
When do VCs want to redeem their shares? When they lose confidence in the company. The company probably can't buy the shares then, though.
When would VCs not exercise right of first refusal? When they don't have money. They would exercise if they thought it was a good opportunity and wanted to maintain their ownership interest.