Hey! Thought I’ll share with you my experience as I’m a Pyro3-Linker2-Warlock now
You need fireballs, esp if you’re planning to go Pyro3. Lvl 15 fireballs and Lvl 15 firewalls are important when you’re questing alone. In the beginning ( say lvl 15-lvl 120), fireballs are super strong. They do get kick around, but just kick them back to the mobs/bosses - you will get used to it. And you can always Joint Penalty your fireballs together with the mobs and Hangman Knot them together. (However your fireballs do bounce away from the mobs after you HK, just kick them back in again LOL).
Early game, I would say max fireballs, flame ground for questing and some points in fire pillar for killing boss and perhaps enchant fire. And then when you’re at Pyro3 and if you can afford it, get skill reset potion from TP shop, skill reset and max up fireballs and firewalls. Reason being Firewall is only good at lvl 15, anything less than lvl15 is pretty meh.
At lvl227, I find that pyro damage is still pretty decent but you’re not exactly top tier damage class. You are still able to solo, using the right equipment, enchanted headgears and anvil your armour and weapon to at least +5 (I do for mine at least, with a +10 weapon).
Usually with this build, people take 2 circles of linking to synergise better with Featherfoot. And that’s what i initial wanted to take which is why I had 2 circles of Linker. However, I opted for Warlock in the end as I didn’t have Surespell and for the higher burst damage. So If I knew I wanted Warlock since the beginning, I probably wouldn’t spent one whole circle on another Linker. Linker C1 is pretty good in most cases, and you can always hunt for Dandel Gem to equip to increase your LinkerC1 to link 6 mobs instead of 5. But these are just my thoughts. I still love my character. It does sound tedious having to kick fireballs around but you kinda get used to it and it’s not that bad HAHA.