I believe it’s a combination of what others here are saying. We live in a world of near instant gratification, getting going on something that requires effort without an immediate payout feels too much like work.

FWIW, I find it helps tremendously to schedule a day / time in advance. For example, I spend the whole week looking forward to “Wrenching Wednesday” so I can go play with my cars. And I actually go do it now, which is something I couldn’t always say before.