Short answer is yes. You can use any liquid with any pad.
Just make logical decisions. For example it's not common practice to use a finish polish with a heavy cutting wool pad.
If you want to share what pads you have and which other liquids we could give more specific guidance.
There are a lot of people with this perspective about things like emojis, social media, technology from the last decade, etc. They just avoid it all and associate it with the younger generation.
No reason to be offended.
While there is overlap in what the tools can do I see them as different tools.
I almost exclusively use the PXE as a 3" DA polisher. Small, light, effective.
I grab the nano to get into tighter spaces and for working even smaller areas where more precision may be needed.
The active gets praise for it's output. It uses a different kind of pump to achieve pressure and flow numbers that no other pressure washer at it's price point can really hit.
That being said it also has a reputation for low quality control and premature failure.
It's like most $200 pressure...
Vision Investments LLC owned by Tony George
You can read the thread on the announcement here.
Vision is (or at least was) the exclusive US importer for Sonax.
I wouldn't expect iron remover to make any difference on water behavior.
Tar-X on the other hand will. It's a fairly aggressive cleaner that will really help unclog a coating.
Perhaps not the tool to use on an entire car but if you suspect a coating is clogged this can be used on a test spot...
Will M105 remove more clear than M205? Yes. Will it remove too much? Hard to say without measuring before and after on a test spot using the process you plan to use on the whole car.
Personally I think the concern over removing clear is a little over blown and causes more worry than it...
Not very often you need to 2 step something with no swirls or scratches. Stick with your M205 or 3D Speed.
What are your goals with the car?
If you want to cut down on number of passes just do fewer passes with M205. It's a SMAT polish so you can work it as little or as long as you...
M105 is not something I'd reach for on Subaru paint.
But then again M105 is not something I'd reach for on any paint nowadays.
The problem with Subaru paint is not so much that it's soft (it is), or thin (might be), it's that it can be sticky. Certain compounds and polishes just don't play...