So let's go over your complaints here.

1. Speed runs you.
2. Game becomes to easy.
3. Level synced to content that should be your progression.
4. Exp, exp, exp.

TBH, it's all baseless whining. While you may be a new player you are forgetting something important that a good amount of MMO's do when they have been out for a while. And that's making leveling easier to catch you up to the current content. However FFXIV is different because everything is locked behind the MSQ and dungeons. So it doesn't matter what level you are anyways. You can be max level all you want but you aren't going to be doing anything level 80ish until you start completing that MSQ that you abandoned at Lv.25. So as follows...

1. No, it doesn't speedrun you. If it did then there would be no need to sell the MSQ completion books for each expansion except Shadowbringers in the store. Leveling faster doesn't mean you will be completing your MSQ and sync dungeons faster. You still do that at your own pace.
2. Past content is already made easier with each new expansion. The longer a MMO is out the easier beginning or earlier content will be to catch you up, etc. This applies to 3 and 4 as well.

You may think it may make the game "Easy" but in reality the game IS easy throughout the MSQ and such. If you want a challenge then you need to reach Lv.80 and start doing Savage/Extreme raids, etc. And once you hit Lv.70 and that buff wears off, getting to 80 will take you a bit the first time going through the MSQ. And of course if you want to level everything to 80 it will take you even longer.