You will adjust, it will take a few days to a few weeks depending on how steep the change is.
As for obsessing over switch weights, yes and no...
Force curves matter more than the bottom out rating itself.
(Note these numbers are not accurate, except where noted near the end. (This took too long as it was, I didn't need to go looking for charts)
Let's start with a linear because it will show what I mean the most.
You can have two identical switches but two different 62g bottom out springs, one may start at 25g the other may start at 30g, this means you could have one switch with a 45g actuation point and another with a 40g actuation point. Same switch, same spring rating, just a different curve and some have a wilder curve than this,
So start/actuation/bottom out could look like:
25g - 40g - 62g
35g - 45g - 62g
Now take a 60g spring and a 63g spring, both with different curves and the difference at actuation point could be as much a 10-15g difference.
start/activation/bottom out could look like:
23g - 38g - 60g
35g - 48g - 63g
While the spring only shows a 3g difference, your fingers are seeing a 5-10g difference where it matters.
Now start with a very soft 60g spring and a rather flat 63g spring
So start/activation/bottom out could look like:
20g - 35g - 60g
40g - 55g - 63g
Now you're hit with a 20g difference at activation.
With one nickle being 5grams, 20g is a massive change.
Now throw tactile bumps into the mix...
How a switch is built decides how the tactile bump changes with the spring, most switches have a set tactile bump, for example browns have about a 5g bump over spring pressure at activation, doesn't matter if it's a 50g spring or an 62g spring the bump will be (about) 5g over whatever the spring pressure is at the actuation point.
So start/bump/falloff/bottom out could look like:
25g - 35g - 30g - 50g
30g - 45g - 35g - 62g
Others switches have a set force, for example 62g Zeals, the tactile bump is relatively locked at 45g (give or take a few grams). So using a lighter the spring, in this case a 39g spring results in the bump growing relative to the spring pressure at activation, instead of the default 8g bump(?) it had with a 62g spring it now has a 25g bump.
So start/bump/falloff/bottom out would look like (note these are semi-accurate numbers!):
30g - 45g - 35g - 62g
15g - 45g - 20g - 39g
In this case, the tactile bump goes from hitting a speed bump to hitting a brick wall and then falling off a cliff.*
I haven't tested it, but I suspect the opposite would happen with a heavier spring, the bump gets washed out more and more.
*Warning
While an interesting combo, do not copy this, it's an example of extremism and it will bite you. While I do successfully use this same NovelkeysOriginative/Sprit 39g spring on several other switches (with varying degrees of effort) the Zeal 62g bump is too sharp for the spring to handle and even though they're lubed and I spent tons of effort to break them in as well as over a year (or 2?) use some switches still fail to reset on slow release. Even just a tiny misalignment of the plate can cause them to bind, seriously, I've spent a ton of time and effort trying to make them function perfect with only some success. I wouldn't recommend going below 45g (would be very difficult still) and would even recommend a 50g minimum spring rate to be reliable, even then you will want an extremely light grease or just go with an oil.
Edit: I said they were Novelkeys springs when they were actually Originative.