Whenever you search for a solution to your problem, it stems from the realization that something is a problem. But sometimes, you have a thing which has been done for a long time, it was a problem with no solution and you've had to accept that. How would you determine one day that things can be done differently and better without constantly reevaluating everything? It's not realistic.
In my view, it is a perfectly reasonable question to ask "what problem does waydroid solve?" To figure out if you have that issue and you didn't know of this solution.
Also, Learning is Fun, so here I have a new toy, let's have fun seeing what I can learn to do with it, then - as you say - that might solve a problem or improve a thing I hadn't thought of before.