One of the reasons for this is that you already experienced a lot of games and there are less of those "first" experiences. Another reason is that AAA and AA has been very same-y for a while (I almost wrote 'trash', but not really, it's pretty cool how far technology has come). AAA doesn't try anything new, AA tries to be AAA. I tend to go back to older games I'm not familiar with and I follow the indie market, there are pretty cool niche games out there which sometimes bring back the spark of that "first-experience" feeling.

it's been almost a decade for me to "digest" this truth. But to be honest, I don't even miss or regret it much anymore. I end up cooking, going out, cleaning up or resting instead. and doing those with the same openness to let them absorb me the way games used to,... man, they sure can be enjoyable