I'd like to see masslock affect hyperspace jumps, but it's not currently intended to, and never has, as far as I know.
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I don't think this is a required defense, by any means. It certainly makes escape easier, but a skilled pilot can avoid the interdiction all together (either by identifying potential interdictors and avoiding them, or by winning the tunnel game) or hold out until frameshift completes despite any masslock (faster ships can get out of range, and most slow ships can take a beating).
New players, or those in ships both weak and slow would find it very difficult, but many of these players either lack the knowledge to hyperspace jump, or don't have the presence of mind to do so while under fire.
I spent the weekend in a Cobra being pirate bait for the fun of it (While running Fed rep missions)
I wanted to see what the newbies are up against now. I was deliberately either standing and Fighting or trying to jump into super cruise. Pre 1.2, a Cobra was pretty much immune to piracy, with only trouble being a Clipper which can't deliver enough firepower at range to hinder a Cobras boost run.
The landscape has changed significantly, pirate/PKers now favour the Vulture.
I was submitting to interdiction without contesting, and also trying to run via SC jumps only. It's enormously difficult to outrun a Vulture in a Cobra the speed difference is vastly overstated. That was boosting in FA-Off.
The quickest way to break weapon range is FA-Off boosting in a straight line, you won't last long enough even to break weapon range. Shields and SCB's can't outpace the Vulture DPS in a Cobra.
Jinxing to avoid fire but you in the fire zone much longer, and the Vulture is more than agile enough to engage a manoeuvring target.
Most time's I did manage to escape, but with no shields and badly damaged, which usually resulted in being interdicted, or caught in normal space again and then summarily destroyed. This was no entry level Cobra either; it was fully equipment, including Mil armour.
Fighting a Vulture in anything less than another Vulture is an exercise in futility. They can literally stay still type in their Cargo demands with impunity while you whittling away at their shields with beams/PA's etc.
Life is a lot tougher now for the new players in populated zone than it was in gamma and pre wings. Dedicated trade ships are even more vulnerable another issue, you shouldn't be taking them into known pirate space without an escort.
I’m not saying the balance is off or need changing; I didn’t really spend enough time to come to any conclusions. But it’s nowhere near as easy as it used to be.