You are just becoming old.

Less time, more money, changing hobbies, etc...

It is almost always better from a practical perspective to buy the complete product over DIY, or even better, not buy at all. Those who claim otherwise are justifying their hobby. Best case scenario, you break even after not counting your time, which is actually great, because most people pay for their hobbies.

The hobbyist movement didn't change, you did, life is like that and that's not a bad thing. The technologies change but the general idea stay the same. For Arduino (the brand), I think it is dying, but that just because you can buy generic ESP32 boards on AliExpress for cheaper and with more variety.