All affixes that are considered "Required" should appear across multiple affixes.

All affixes that are considered "Required" should appear across multiple affixes.

Case in point: damage on weapons. This is considered a required stat. And there are multiple different affixes that give flat damage on weapons. Along with multiple different affixes have %increased damage. And they stack.

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I believe finding replacement gear for any particular slot should, at minimum, occur every act and every 20 end game maps at a higher waystone than what you used before. This is not how it is current. I can't find replacements because certain must have affixes aren't common enough.
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Movement Speed, a required stat, is supported by one extremely rare affix. It should be hybrid with multiple different stats so it shows up more frequently, yet still has a low chance of being extremely high (aka, chase stat). I used a lvl 1 boots with 10 move speed till act 3. I picked up all the boots and alt, trans them looking for movement speed too. Replaced my boots a second time in act 4, and again in act 6. Have not replaced at all in waystones, and I'm on waystone 8 in the quests.

Movement speed should have multiple affixes that hybrid with other stats. Same rarity of a high role, an order of magnitude more common for lesser rolls.

For casters, + Spell Level is a required stat on your weapon. +3 to spell level is a multiplier on par with 100% increased damage given all the sources of increased damage on the tree. Spell level is an extremely rare mod. I found a staff with +spell, +fire, and +fire spell level in act 5. I have not been able to replace it, even though I'm in waystone 8. I pick up every wand and staff, and blue/regal, and if those don't hit, bench merge them and see if that hits. And I exalt rare staffs that are good enough. Never rolled another +4. Not even +4 with bad stats. At level 1, one in five wands/staff have +spell level. This rate feels good and should exist for the rest of the game.

+Spell level should have multiple affixes that hybrid it with other stat. Same rarity of a high role, an order of magnitude more common for lesser rolls.

Side Note, Mana on weapons should be switched to suffix. It is a defensive/support stat instead raw damage output. Does martial weapons have health as a prefix? No. Prefixes on weapons should only contain affixes that directly increases damage, just like how Prefixes on armor only increase defense/health/mana. Thus, mana should be a suffix.

Side note side note. For caster weapons, a less mana cost suffix that also hybrids with mana is a better trash stat than the current trash stats.