Do you always play the same openings?

Interesting question! Long ago, as an improving player 1200-2200, I played almost everything as black and white. Sometime back then a friend, Philip Lamb, pointed out that as white I was much better with e4 than the rest so I dropped d4,c4,... . Then I had a 40 year gap of no chess and started again a year or 2 ago. I am now old and pretty average these days. I knew I'd need to focus so went thru my old games looking for what seemed to work best and decided to play those only 2 defenses as black. So now I am very limited and can see it may get boring in time-f it does I'll add a 3rd defense. I am glad that long ago I played KID a lot. I learned much playing it and many variations can be steered into those type of positions.

#6
"Quite a few GMs play lots of openings"
But they are GM and we are not.
Some GM stay with the same openings (Fischer & Kasparov: Najdorf, King's Indian Defence, Ruy Lopez, Vachier-Lagrave: Najdorf & Grünfeld, Caruana: Petrov...) Some vary openings so as to evade preparation: their opponents study all games they have ever played beforehand. GM also play much more games than amateurs. They play and analyse full time as chess is their profession. As an amateur you cannot accumulate experience if you change openings like you change underwear. Grandmasters also have more play maturity: contrary to amateurs they can play an unfamiliar type of position without strategic or tactical errors.