Biggest difference over the last 2/3 years is that the minimal speed in table tennis has increased noticeably.
Many still have left foot forward on FH or right on BH. Balls to the middle then cause problems. It is same if you keep the shoulder forward you then create a weakness. If you move in (say to the short ball) it’s important that you move back in the same movement.
It is vital that players stay more square and are ready for the next stroke. Distance from the table is now nearer, it's harder to win points from back with the big ball (due to lesser spin and no glue assist). Even defenders chop and move forward to be ready for the shorter ball.
Now one big step not several small, speed of the essence. Most players are standing wider so that less movement is needed.
BH from middle is now common, many top men are following the women and using their tactics, using the BH much more from the middle, both against the serve and in the rallies. (Maze, Bentsen, Schlager, Cioti, Crisnan, Kreanga, Chuan, Chen Qi, Boll)
Nearly all tables now have a composite surface and are not made fully of wood. As a result the ball doesn’t bounce and tends to slide it is therefore very difficult to judge the ‘peak’ of the bounce and this particularly affects the women’s game as they drive more than spin and in consequence need to take the ball at the top of the bounce latest, or preferably 2/3 centimetres before.
or in future pre-glued rubbers It’s much more difficult to play float or no spin balls with a glued up racket. Spin tends to give some measure of control to the shot. The fast loop glue players tend to have problems against defenders who can float well and servers who use long, fast float serves or serve or play short with topspin. The float ball tends to just spring off the racket.