I'm going to take a Devils Advocate position on this one, since I don't really care either way, and habitually keep end-saves from my favourite games.
CDPR announced they would be advertising for TW3 differently than previously, lets face it - primarily to reach a wider audience, people who perhaps haven't played the first 2 games, with the consequence of hopefully selling more editions of them.
If an option to pick through the various choices is supplied, this could lessen the desire of new players to investigate the older games, and would certainly ruin any playthrough by self-spoiling.
I want CDPR to make as much money as possible, they deserve it for their excellent treatment of us, the gamers. I don't want them to shoot themselves in the foot. Plus, TW1 & TW2 will remain highly playable games for years to come.
Note: I have and used my original TW1 Yaevinn / Shani save, which I incorporated into all 3 of my TW2 playthroughs whose end saves I also keep, and am anticipating a further playthrough of both games ala Siegfried / Triss --> Roche for a fully human-centric Geralt end-save to incorporate into TW3, hopefully giving me a good basis for role-playing Geralt differently, depending on my mood.
p.s. TW1 is a long game to play, but TW2 is very short (my sole gripe with the game, soon to be cured by the redkit). And TW1's choices don't matter as much as you'd like when incorporated into TW2.