It's like playing a massive online game, where the skill slots fill the screen with a myriad of options; too many choices can cause hesitation when making decisions during emergencies.
But sometimes, a moment of hesitation in battle can be fatal.
He already had a jumble of abilities under his belt, yet his 'Mana Bar' was still so limited.
Moreover, he lacked overpowered Arcane Arts abilities like Ultimate Rank 9 Arcane Time Stop combined with the legendary Arcane Time Duplication. These would have allowed him to unleash a dozen spells in 'Bullet Time' to overwhelm enemies. Consequently, his battles remained 'tit-for-tat' and 'semi-turn-based'.
As a result, his usual combat style involved initiating with a powerful move (Breath of Flames), then using Gluttony to recover some mana. Subsequently, he would engage in direct confrontations with both Arrogance and Greed activated, while simultaneously employing Jealousy for spell counters.