Dailies
Once you have an 80, the dailies then are assigned as if you have an 80 available. I really don’t know what would happen if you deleted her, whether your account toggle would go back to no-80’s daily sets.
However, you are not required to do them on your 80 unless the daily is in an area only an 80 can reach. For example, if the daily is Kryta Forager, the lettuce field west of Beetletun is your friend and you could possibly get it done on a level 5 or so. You also can take your non-80s to WvW or PvP to do those dailies, though as a PvE aficionado I agree that could be annoying. The only one of those I do is Big Spender since I can buy a badge from the guild hall vendor and boom, done.
The WvW dailes veteran creature slayer, guard killer, land claimer, caravan disruptor, and master of monuments are also all basically PvE. If you do them right at reset there is often a group of people you can do them with. For example you’ll have like 20 people waiting around waiting for the veteran creature to spawn. All of those dailies barely require you to leave your home base and are often quicker than PvE ones.
You can do the dailies on any toon. There’s no level restriction.
Some dailies, however, are hard to do on a sub-L80, if only because the zone they are in requires higher level toons.
What is the reason you prefer to do the dailies on sub-L80s? Perhaps there’s another way to address that.
John Smith: “you should kill monsters, because killing monsters is awesome.”
PvE dailies often contain a jumping puzzle and event completer. If you used the level booster to prop yourself to 80, it’s possible you may not have access to too many areas. Event completer can be problematic if one lacks tagging ability and people are just running around doing every event they see.
WvW dailies (veteran slayer, and sometimes land claimer) can be very easy to get, though you may have to be sneaky.
A final and IMO not fun, alternative is to go for Hotjoin PvP. Those aren’t serious games and a lot of people are there for dailies.
For once you have tasted flight you will walk the earth with your eyes turned skywards,
for there you have been and there you will long to return.
for there you have been and there you will long to return.
Assuming you do not need the shards now or in the future you might want to do Teq instead. It will give you one gold (vs 2 on the dailies) but you also get a bunch of stuff to salvage (and lots of karma) and a chance at ascended stuff … all for 15 minutes work plus getting to the zone a few minutes before it so you get a good map. Of course, there are plenty of other things you can do daily, but a world boss is the most predictable.