Every ship build I find when looking for exploration builds have as big a jump range as possible. Forgive me if I am being a complete tool, but isn’t the point of exploration to explore as many systems as possible, and therefore not need long jump range?
There's a few different reasons involved.
1) There are
very few modules which are really useful in exploration anyway (and a lot of the useful ones are either massless or very light), so if you're building a pure exploration ship rather than a multirole you can also do some exploring in, it's going to end up fairly lightweight anyway once you've thrown out everything you don't need in deep space.
2) If you specifically want to explore systems near the galactic core or out the other side of the galaxy, sure, you might switch to economic routing once you get there but it's going to be a lot quicker to get there with a 50 LY jump range than a 20 LY one. There are plenty of things you'll never find within a few thousand LY of Sol no matter how many millions of systems you jump through.
3) As others have said, in a lot of the sparser bits of space every extra LY of range can be the difference between being able to make a jump or not (or needing to use FSD synthesis on a particular jump or not)
4) You're not going to explore
fewer systems with a longer jump range, they'll just be further apart.
On the other side:
1) Especially once you get above about 50 LY range, the extra travel speed you gain has very diminishing returns. So there's usually plenty of room to take a few extra bits without seriously affecting your time per 1000 LY or similar.
2) If you're going on a weeks-long exploration trip by far the most important thing is that you enjoy flying the ship. So, sure, the Anaconda has the best jump range but other ships are nicer to fly and/or have better cockpit views and/or are easier to land on planets.
3) If you're willing to return to the bubble occasionally to refuel or mine Tritium, then once you get established you can take a Fleet Carrier and not need to worry about how long range your
ships are.