For me, most long game losses are actually FUN. Early game stomp losses are absolutely not fun. If the game goes long it means we might have had some chances to come back (or they were jerks and trolling but still gives us a chance)... or we lost a crucial fight and gave them the chance lol.
For sure, I can understand if you are just seeking purely LP, it sucks to waste 1 hour to lose LP. But longer games are better for me to enjoy.
Although learning lategame right now sucks, because you often won't get to 6 items. So you are learning very rarely used skills. When I started just last year I would often get 4-6 items. And so I really liked that stage of the game. And now I only play support, so my 6 items aren't very fun.