Actually, this is the most fascinating point for me. Because I was really merged up with these points for so long.
So, as per my knowledge, I think,
Naturally, Titans (AI or Player) return with whatever levels they have procured in spite of the fact that they are more costly.
You can get a mod that resets them to 1 however it sucks when you lose your Titan.
For some set of experiences, titans returning at the level they passed on was actualized during the Rebellion beta in 2012. The worry was that titans were so incredible, late-game that in the event that you lost your elevated level Titan, and your adversary didn't, you practically lost the game by then in light of the fact that regardless of how extraordinary your economy is, you're probably not going to step up that Titan extremely far once more.
The expectation was this would forestall PVP games from transforming into whoever keeps their Titan alive longest successes. I don't play enough PVP to realize how well it functions by and by, yet that is the place where it comes from.