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How would you feel about introducing 2 new rules into 40K that take direct inspiration from Warhammer fanatsy. When a unit is destroyed completely all units within 6'' must take a panic check, and Immune to psychology which grants immunity to this rule and fear, not that anyone cares about fear.

Immune to Psychology would be available for most combat armies. For example All Daemons, all Ork squads that contain a Nob, I would make it available to Dark Eldar on the Power Through Pain table on turn 2. Fearless units would of course ignore this so Tyranids are fine and so are Priest or Commissarate Guard (well, not immune but resistant). Marines would still take the panic check, but would auto rally next turn to show them moving from an obviously dangerous area to a safer one. The idea is to punish armies that can sit in a gunline or at the edge of the board with no fear of reprisals, where now an assault army with limited shooting can concentrate into a single unit with the hope of setting off a chain reaction. For example Tau and Guard are a buff stacking army that rely on being close to each other and while this rule would heavily affect them it would also encourage the use of leadership based models (Commissarate and Etherals) that are currently rarely used.

Just seems like a Fantasy rule that would help make 40K a bit more dynamic.

It would be all right, and make sense, except we don't really need it.
I myself run a close combat army and play against guard and tau frequently: if you have the right army it is easy to smash through their lines. As you said tau and guard rely on such buffs so punishing them for taking these buffs would make their armies useless.

Also would this cause the unit to run as with moral checks?
If a tau army is close to their board edge a few unlucky roles would wipe them out, that is a bit op.

Armies being worthless is a bit of an exaggeration, both Tau and Guard have access to a HQ that grants a large radius of Ld 10.= that is currently rarely taken. Now it has a distinct use, like buying a BSB in fantasy, not necessary but useful for reliability.

It's not much of a nerf, Tau can deploy 8'' away form the edge of the board with their gunline and be safe 90% of the time (fail Ld 7/8(Shas'ui)/10(Etheral) then flee 9'' on 2 dice). It's also stops Eldar Jetbikers hiding in the corner of the board with their 36'' range, hug the boards edge at your own peril. I'd say it adds some counter play to a very boring and powerful army type (gunline or edge hugging mobility).

While I like moral as a mechanic, and wish there were less negating factors for it in 40k, I feel like this goes a little too far. Causing a unit lost to potentially send a cascade of other units running can turn the tide in a fight drastically. I think you should keep the rules from causing one bad turn becoming a cascade of negative effects.

I still can't find a great way to force panic / phase out checks when you are losing on kill points and objectives and award bonus points for voluntarily retreating units off your board edge while you are winning.

Morale!

I think 40k would benefit from a more graduated/proportional morale mechanic.

The current range of 'OK then just run away' type morale rules.Mean that most armies tend to get other rules to ignore this type of rule completely.

Some form of comparison of attacker threat and target confidence during the normal resolution would be my preference.

EG
The number of failed saves from shooting. If a unit suffers more failed saves than half of the remaining wounds in the unit in the shooting phase, it becomes suppressed,(Even if the failed saves cause no wounds.)

The number of surviving models after assault, determine if unit falls back, routes, holds or can persue falling back/routing enemy.