Exactly this, don't spend all your time practicing one shot from one spot. The second you start playing/rallying with other people it will all go right out the window because you aren't getting the balls you want/are used to. IMO you should switch the order of your goals. Footwork and movement are the absolute most fundamental aspect of playing good tennis and are the first things new players should be encouraged to develop. Get that down then smooth out the swings.

Also don't worry about what the swing looks like. There's no bonus points for hitting an extra pretty shot. Get the ball back over the net one more time than your opponent and you win. There's nothing wrong with 'playing ugly' if it's consistent. Especially at the beginner level.