4 spells/skills only?

If someone can pls explain, are there only 4 hero spells/abilites to use in DOTA 2?

Most heroes only have 4 abilities. I know what you're thinking but, it's unfair.

For example:
Shadow Demon his fifth ability Shadow Poison Release only causes the damage from his third ability Shadow Poison to damage now instead of in a few seconds.

Puck 's fifth ability Ethereal Jaunt lets him teleport to the spot of his first ability Illusory Orb.

Morphling 's third Morph(Agility Gain) and forth ability Morph(Strength Gain) allow him to alter his stats for more agility or strength, but it proportionally lowers the opposite stat.

Invoker is different from all the rest of the other heroes his abilities. His first three skills Quas Wex and Exort all give bonuses to Invoker, and they all combine into 2 other skills when he uses his ultimate Invoke giving him a total of 10 extra skills depending on what combination of his first three skills he uses. This makes him by far the hardest hero to play and master.

I think I hit all of the heroes with 5 or more skills, if I didn't I'm sure someone else will fill in the gaps.

Kunkka, Brewmaster, Lone Druid, Ogre Magi, Doom, SF all have more than 4 skills.

Yet to be ported, Wisp, Phoenix, Troll, Ember Spirit, Techies, Rubick, Visage, Ezalor all have more than 4 skills.

If you want more skills, play Invoker.

IF you are a WoW player or something, and you are used to using 50+ skills, then DotA 2 isn't that game :p