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would you be willing to ditch Chrome for... Lynx?

Lynx is not alternative, but not because it's text-based (I'm fine with that), but because it does not supports javascript and because of that most sites won't work fine with it. Otherwise I would have already used it in some cases.
Also, this comparison is bad, because showing images - is one of browser's features, and obviously Lynx can't have it, and that may be a reason not to use it. So it's not about interface, it's about features. For example, plugin I mentioned above lacks one of SAM features - manual changing of stats (it changes those automatically when it's needed for achievements though). If you need this - plugin is not alternative, otherwise - it is.

Why make Linux when we have Windows?

Because of features Windows don't have. Linux isn't an exact copy on Windows, neither by interface nor by features, so, by your definition - it's not an alternative (as it's not close).

Thing is, there has to be a reason to try something new. And I can imagine two reasons:

1. New thing does something, that old thing can't do (and you want this something)
2. Old thing does not work as it used to, but new thing works.

Let's check it.
Example 1:
Look, there was Idle Master, but I switched to ASF, why?
Because Idle Master was unable to work on linux server (to run it constantly), but ASF was able to do it - it's point 1,
new thing does something that old thing can't.

Example 2:
Some people who used Idle Master switched to Card Idle Remastered - because Idle Master does not works anymore, but Card Idle Remastered (that is for of Idle Master) works - point 2, old thing does not work.

Example 3:
There is a tool (I don't remember it's name), that is similar to SAM, but can only reset Achievements (but can't set). Some people switched to it because they want to get achievements in favorite game again, but they consider unlocking achievements with a tool something bad, so lack of achievement unlocking is a feature in this case, so point 1.

Opinion 1:
As I said above, achievement management considered bad by some users. Thus, some people, who use SAM as a tool to idle games (yes, there are users like that) can switch to this new tool, exactly because it does not have achievement management. So, lack of achievement management is a feature in this case - point 1.

Opinion 2:
People who use SAM to unlock achievement can for sure switch to some tool if SAM will stop to work correctly. But thing is, if unlocking is based on exactly the same approach - it's most probable that new tool like that will stop working too! And plugin may still work, as it's based on different approach (or it could be vice versa, plugin will stop working, but SAM will still work. But in that case no reason to switch from SAM).

Ah I see
.. also your Snake Simulator is very cool :D

Well, I would never choose your idler, BUT I know for sure some people actually use SAM for idling, and that's beyond my understanding, so I guess your tool may have some user base too. People are strange.