This was a great season of MacBook. I use a couple a1078 5,1 & 5,5 (2008 & 2009) unibodys everyday. Collectively, they still get more DD use than my m2 mbp which is a fantastic, beastly portable. The a1078s despite being C2D CPUs still have no issues with retro console emus, word processing, surfing, pulling email and watching YT or even uploading video content albeit they do it a bit slower, will definitely get hot on the lap and their battery isn’t the greatest - makes great sense to open it up and blowout and clean/repaste the cpu if you plan to daily it. I enjoy mine and have zero plans retiring them and will continue to use them until they break or the internet sits on them. One hangs out upstairs running El Cap and one runs downstairs with El Cap but I typically daily ElementaryOS there.
Truthfully I never tried Mojave on one of these machines. I did briefly run Catalina but it ran noticeably hot, would freeze up completely upon indexing maxing cores to 100% for minutes at a time and I had issues with WiFi upon wake that I was unable to resolve. It was neat but Cat ime seemed to be a little too much for the 5,1. I’ll pop in a spare ssd and play around with Mojave this weekend.
My opinion on macos is that it hit its peak in design & function around this season/era as well which is another reason I use it heavily still - Leopard, Snow Leopard, Lion, El Cap etc. There are i-device synced innovations over later iterations that are neat and nice to have like messages (hence ElCap), airdrop etc but with those came changes to lay out that mimicked iOS menus for example that negatively impacted MacOS spaces like sys pref etc. and functionality was neutered from apps like DU. Anyways iOS and Macos are not the same thus should have & retain unique design imo and it is pretty obvious that Apple does not align with this exactly.
Having the flexibility to return a modern AS MacOS installation to the layout of something older would be awesome. I dont see Apple wasting any energy on this at all but for a dev to accomplish this (like what leopard rebirth or Sorbet's theme package was to PowerPC) would be pretty cool.