I think everyone got a bit spoiled by the old Mana situation
I think everyone got a bit spoiled from buying one item then never having to worry about Mana ever again.
As a jungler, I remember when you got the first blue and that was about it most of the time. Every time after that it was passed over to mid. Once they made the changes where you just built Morello/RoA/Tear and never had to worry about Mana, this kind of went away. I mean there was also the removal of the bonus AP that played a part if I'm being fair. But after those changes, the second blue was almost always mine. A lot of the time midlaners didn't even want to leave lane to come get it and would tell me to take it. Sometimes it would even be passed off to top or support, not in the early game though.
As a jungler I got spoiled by having all these extra blue buffs to spam away and power clear. Mid obviously got a bit spoiled as well
I think to solve the issues we're currently looking at in regards to this specific issue, I think we need to move back to the old system of handing off blue after the first, maybe second one. This used to be kind of an unwritten rule.
The issue with this is changing the playstyle of the community as a whole is, well, very difficult ._.