First off, be realistic. The game is nearly 10 years old. IV are not currently developing new features for the game, and almost certainly have no intention of releasing any new patches. There are members of the community who have paid for the dev CD who are actively developing Uplink, so there is a non-zero (though still very small) chance that another patch with new features will be released. I wouldn't hold my breath.
Second, the lack of a save feature may not have originally been a part of the meta-game, when Uplink was released in 2001. However, it very quickly became a part of the meta-game. It is understood that Uplink contains a meta-game, and you can either assume that a lack of save files is a part of that, or you can continue to be angry and petulant. No one else is going to change the game to suit your desire for save files.
Third, as I said above, you are free to make the change yourself. If you can't or won't do that, don't cry to us.
Fourth, Uplink has been very successful. Why should Introversion add the save game feature that you want? It has sold very well over the last 10 years, and is reaching its intended audience. Why should IV go back to a game that is a decade old, and spend time developing new features for it when they have other, more interesting (to them) projects to work on? especially when the tools to develop such a modification are available?
Lastly, you should probably read through Introversion's manifesto
. I don't know if IV still subscribe to those ideas (though I would think that they do), but they certainly felt that way when Uplink was produced. Uplink is, then, an artistic expression. You might especially note the section headed by the sentence "The common assumption “Above all else, a game must be fun” is FUNDAMENTALLY FLAWED." Uplink creates frustration when you lose a profile that you have spent several hours on. On the other hand, there is a kind of high that you get when you figure out what you did wrong, and fix it. The high would not be so good if the low were not so bad. Does this create a negative reaction? It can. Does this create situations where Uplink is not fun? Sure. Is this a bad thing? Most of us here would answer in the negative.
You seem to think that Introversion should create games to sell to every person on the planet (or, at least, a larger subset of people on the planet than they currently sell to). That is not how IV operate---they make games that they would want to play, and hope that enough other people will want to play, too. For all that you may be a middle-aged, home-owning, game designer, you are currently acting like a self-centered three year old. You want what you want and you want it now, and you don't want to work for it, and you think that the world should reshape itself around your desires.
Don't let the door hit you on the way out.