I could go on to show his speed how he dodges lasers and bullets with ease or the lightning of weather wizard, but there really isn't a point.
I could also show how he's used his TP to know when he was targeted and sense attacks or planned ones ( giving him a huge reaction advantage)
These are all pre Nu52 Aquaman ( that everyone thinks is so upgraded) from an era where they showed off his TP power more than his physical one. Where he has TP read Jonn Jonz, battled and defeated a dimensional entity, ripped white martians new ones or simply shut them down, mind raped another powerful TPer the backlash of which caused every living creature in the sea intense pain.
Add to all of this the healing powers of the water hand and any damage that is actually done to him can be voided almost instantly.
I'll grant that Namor has more consistency of his showings at that level but Arthur doesn't and never did need the water hand. It just made him OP.
You don't know much about Namor then. The guy has had at least a dozen slugfests with the hulk and has actually won two of them. I can post a dozen showings for him which are better than what you posted. I'm too lazy at this point in morning though.
How about "beat the shit out of arthur"?
Apart from that the Waterhand could also reach into another character and mess them from within.
And of course control water.
Even without the water hand though Aquaman has this.
Apart from him being considerably faster than Namor, AQ could control even the smallest living sea organisms.
He beat one opponent by controlling the plankton in the water that he breathed and totally wrecked him (issue 23 I believe from the Pfeifer run)
Like also dodging light speed attacks and having better quantifiable feats.
Namor's best one's I know are doing 400 knots vs Iron Man in recent years.
And he was also confirmed as slower than Marina (due to her body not creating any friction) and Marina's top speed was around 800 knots or something.
Aquaman has casually done 1000 knots.
And that is not even remotely close Aquaman's best feat.