Hi and welcome here. Some fantastic racing scores you have. 6 months ago i also bought a Dreamcast and recently the SEGA Arcade stick. That stick was more expensive than the Dreamcast :) But still untouched. I hope to play those schmups soon. But so many platforms and games to enjoy, so little time :)
Yes, it is hard to beat the gameplay of the games on older systems, I enjoy them just as much as modern games. Picking up a retro console with some games reasonably cheap is great fun, I have had more consoles bought, sold, re-bought than I care to remember over the years, but I can't say I didn't enjoy it lol.
Time you spend enjoying, is time well spent, it may be short but at least its quality!