What are the advantages and disadvantages of both options?
I think the only advantage of keeping your funds in one wallet is easier access, but it would be devastating if the wallet gets hacked. On the other side, having your funds on different wallets created on various devices is somehow troublesome and needs more effort but the security of preventing a total loss when hacked happens is much higher.
Of course it is true what you said above but still the final choice is in our hands, which is more comfortable. I think one wallet is enough if handled properly and safely. related to hacking, it is something that can happen at any time whether we consciously make mistakes or not, what is important is that we look for the most recommended wallet selection pattern, it can be elsewhere or on this forum. I am sure our seniors have special ones and are guaranteed to work well and safely.