Hiya!
Toe-may-to, toe-mah-ta, I guess. I'd say "
Unfortunately, 3e changed all of that".
I see a Prestige Class as a "higher calling" type of thing. Something that a character would stick with his entire life once he is "in the club", so to speak. Now, I'm not adverse to having a PC give up on his PrC in an extreme situation (sort of like a priest loosing his faith and stepping down as Bishop or whatever). I may allow a PC to "drop" a PrC and go back to his old ways (class), but all the PrC stuff he got would be 'lost' (re: no special stuff). There would also likely be repercussions for leaving a PrC (the "Death Touched Warriors" may not take kindly to someone they sponsored, killed, raised from the dead, and taught the secrets of their order...). Skills learned I could let him keep maybe...have to figure out a way to work that back in. Shouldn't be too hard for skills, but no way would I let a "Death Touched Warrior" keep his Death Touch attack, go back to Fighter, and keep gaining levels as a Fighter with all the special stuff he gained in his PrC. As I said..."replacement, not additional".
The thing I hated most about 3.x/PF PrC's was the never ending treadmill of "+1UP" stuff. Just look at virtually ANY "non-single-class-build" characters for 3.x and you will see meticulously chosen Feat chains, level-dips galore and PrC choice(s) to match. Those characters are almost
never built to enhance the campaign or anyone else's enjoyment at the table; they are there almost exclusively to inflate the ego's of the character "builder" and try and game/win the system.
I know my words are a bit harsh, but I
really hate the way MC'ing and PrC's turned out in 3.x/PF. Really. Really really. And, from the look of it, 5e's designers seem to be heading down the same path, more or less. In my games, if you want to play an epic hero...you have to
play as an epic hero. I don't let a player get away with just picking a certain character 'build'; that never ends well for the PC or the player.
You, the player, have to attempt heroic deeds, say heroic things, and behave in a heroic manner. Just saying "I have AC 26 and 3 attacks that do 122 DPS!" is going to get you nowhere on the "NPC's look up to you as a hero" scale in my games. This all rolls into my PrC mentality. Just trying to gain mechanical stuff and slapping "Death Touched Warrior 1st" after your class level isn't happening. You have to work for it, in game, in character.
But that's me. As your quote above indicates...you seem to favor the mechanical fun of building to get some preconceived concept. Fair enough, to each his/her own.

Enjoy what you want and have fun!
^_^
Paul L. Ming