So, for maps, ofc you can do them with a pack of tames, no doubt about that.
But, it is inconvinient at least, it starts with them following to the map.
Climbing hills, hf
Someone prebuild a ramp, hf
Map an the edge of a mountain, hf
....
You can do maps with crows too (i assume) , its just a matter of numbers ...
So the question is what tame you need to clear every map solo (one tame one rider).
I dont think a crab can do it anymore, it was hard before buff. Now i hear from expirienced players that they can not do it anymore, even hard with 3 of them (all mounted).
Good enough bear and tiger still can. But the player needs to adapt. There is more chances to get you and your tame killed.