Suggestions around Undead

I'd like to make some suggestions that would improve the current state of the game around Undead creatures, by making them more cohesive, easier to fight when prepared and/or with Clerics or Paladins, and harder to fight when unprepared:

1) All Skeleton-based creatures should be vulnerable to Bludgeoning damage and resistant to Piercing and Slashing.

2) All Zombie-based creatures should be vulnerable to Slashing damage and resistant to Piercing and Bludgeoning.

3) All Undead creatures should be immune to Poison, Charmed, Exhaustion, Frightened, Incapacitated and Poisoned.

4) All Undead creatures should be healed instead of damaged by Necrotic.

5) All Undead creatures should be damaged instead of healed by Healing Spells.

6) All non-Ghostly Undead creatures should have Undead Fortitude.

7) Damage from Healing Spells should behave like Radiant damage regarding Undead Fortitude.

I think the above changes would make D&D 5.5 / 2024 the best D&D version ever around undeads. It would finally turn Necromancers (*coff coff* biggest villain of FR *coff coff*) into the threat they are seen as, and finally make sense to outlaw the Necromancy school on most of FR's realms.

1. Giving all skeletons two resistances is kinda insane, this is a complete buff in their favour and makes enemies that you typically kill by the dozen harder to clean up. This is definitely something that would bump their CR up.

2. Again, why? Why should zombies have those resistances, bludgeoning is literally one of the most famous ways to kill a zombie along with headshots from ranged weapons. They already have uniformly low ACs, dexterity and their undead fortitude.

3. Why would you give EVERY undead creature at least 5 condition immunities and 1 damage immunity? That makes a concerning amount of spells useless against them when most are already like that. How does being immune to incapacitated make sense, are Zombies suddenly phase through plants and webs? 

4. So are we just removing every Necrotic damage from ever affecting one of the most well used creature types? You also buff Necromancer wizards to comedic levels since they have cantrips that can just heal their undead after every fight. That group of skeletons they have are now always fighting at peak efficiency.

5 & 7. Do they get saves, do you have to make attack rolls? 

6. This makes the zombies unique gimmick a complete joke since it’s given to everyone now, including ghosts. Also necromancers are still dangerous without these random changes, your defiling people's corpses and turning them into flesh eating monsters, how would stronger undead make it change? Do you actually read FR lore at all or do you scroll through the wiki, Necromancy isn’t seen as evil because they make strong minions, its cause so many people who do it are unscrupulous psychopaths that result:

Undead outbreaks

Liches

The slave empire of Thay

& literally Orcus, the demon lord of undeath, who will silence all life in the multiverse.