I already posted the software sales percentage. It's not even close.
As more games release on Switch that percentage will grow and keep growing. Obviously a system in its fifth year on the market has a bigger library than a system in its first year and can therefor sell more software. Not to mention that the PS4's userbase is still five times bigger than the Switch.
Things are changing.
If you want to do a legit comparison you should compare the PS4's first year with that of the Switch.
So, we agree that Amazon isn't representative of the software market?
Switch's market share will increase due to the PS4's age. After a certain age, a console's yearly sales drop.
We cannot do a comparison of the PS4's first year because we do not have the data. That's not even mentioning that the PS4 has direct competitions from the X1 and PC.
Also, you're forgetting 2 important factors that affect sales on the PS4 - PS+ and F2P games.
As for your claim that things are changing - you haven't backed that up.