It does tell you that it's been changed, though. You can typically still go and play the original game. And it enables the people affected by -isms to enjoy it when sometimes said -isms would pull them out of it for them otherwise.
And it's not like the original intent was for people to be distracted by what would have, to the developers, have likely seemed a small or unquestioned detail. We can never truly approach a game the way its original audience did anyway because culture changes so much, and a large part the experience you have with art is what you bring to it. Thus why graphical updates can make the game look like you remember it, even though it now looks much prettier. I think these sorts of updates can be similar to that.
Granted, it's harder to access the original game because of hardware. But even so, a lot of original intent is always lost in the process of making a remaster. I'd argue "for modern audience" updates tend to be less of a departure than changes in visual design (the different lighting in the various Myst remasters that changes the mood, the extra foliage in Shadow of the Colossus remasters) or mechanics updates (the ability to control Resident Evil like a regular game instead of via tank controls).
Edit: I think my ideal scenario would be if remasters include "modern audience" updates of all kinds, to make the game as enjoyable for new players as possible, but also that the originals be made more easily available such as by legalizing or sanctioning emulation for old games.