Welcome to adult life. Don't trust anyone telling you that this is the new normal. The people that tell you this are just lazy to change their life around. Just take a break from gaming for a bit or just don't play every day like you did before. Take some time out if you want to game and otherwise just do different other things. You can manage your gaming time just fine if you are organized.
4 hours a day during the week? Lol.
You've had it incredibly well compared to most in their 20s working full time.
Without kids this is really not that difficult. Some people plan their weeks out and have more than enough spare time on their weekdays. I mean just for example:
I wake up at 7:00am, shower, breakfast, short japanese lesson in the morning, doing a few chores
Get out of the house at 8:30, arrive at work at 9:30
Go home at 17:30, get home at 18:30
If I haven't prepared anything the evening before or the weekend I will have to make some food, including eating it should be 19:30 then
4 1/2 hours of playing games (or more if I get into bed at around 1:00 am)
Some days like today I use these hours for friends, others I use them for sports and sometimes I have something to do on weekdays where I have to sacrifice a bit of that time, but it's really not that difficult.
I most often precook on weekends and just freeze my tasty food so that I don't waste so much time cooking food. On Thursdays I always meet up with a friend of mine where we buy groceries for the whole week and then cook something big and watch series together till 11pm (he has to wake up at 5:30 am lol) so I don't even have to buy groceries on any other day of the week and set. Cleaning my house is almost automatic (I have a robot that vacuums and wipes the floor, I also have a dish cleaner and a washing machine that also dries my clothes so I don't waste any time here). On Saturdays I always clean my bathroom in the morning and on weekdays I clean a small thing every evening in about 5 minutes.
I can see that point with people having to work more, having kids, having a longer commute and other things, but it is possible and if it doesn't work out for someone they have to look what they priorize and what they can optimize. With a girlfriend it's not really that different, I just do different things on different days and it works out with people having their own interests and communicating :)