I stopped using a ROS a couple of years ago.
I now sand by hand because its faster, raises less dust, is easier on your hands and gives you a superior result/ finish.
Try it once with an open mind and time yourself for both methods.
Let's say you are doing a flat panel that was just milled as an example.
Start with 80 grit paper using a hard rubber backed sanding pad. I prefer the cheap yellow pads you can find at harbor freight for about $5.
Use a heavy weight psa paper, I have been recently using siaspeed but I started with some StGobain paper in 2 or 3" wide rolls.
Get 80,120, 150, 180,220 and perhaps 400 and 800 depending on what type of finish you are looking for.
Get some white nylon pads and a cheap paint brush.
For a trial of this you can use the hook and loop disks you use for your sander now and a block of wood cut to size As a sanding block.
Take a pencil and don't jam it into your work but cover the area you want to sand with pencil marks.
I have used charcoal pencils for this part.
Sand with the grain until the pencil marks are removed. The 80 grit session will take you the longest and it may take you two sessions to remove the mill marks.
Sometimes I shine a light to see if the mill marks are removed, other times I wet the wood to see any deep marks remain.
Use the brush to remove the dust, do not use compressed air. That will force dust into the pores and make the sawdust airborne.
Repeat for each grit sing the brush for removing the sawdust on each grit. You will notice the pencil lines disappearing faster each time you step up on the grits.
When you are done, use the white pads to remove the rest of the dust.
You will not believe the results if done properly. It's actually faster than a orbit sander and you can see and feel the difference.
The wood will actually shine!
You will not have a problem with the wood absorbing stain if you are coloring the wood.
I was a diehard power tool user before going to this method.
I bought expensive Mirka paper and good quality Bosch Sanders rated very highly.
It's a lot easier on my hands, no more tingling afterwards and no expensive dust collection systems needed.
It's much quieter, you will not damage your hearing, its faster and its less expensive to purchase and maintain.