Before AOS there was a time you can Explosion + EB combo with a Halberd hit following up to end things. After AOS You have Spell Channeling weapon where many skilled pvp players took the advantage of mastering Fencing and spam Magics at the same time. They were extremely effective and they definitely have "mastered" both fighter skill as well as mage skills. As for Tamer just as I have mentioned some players have planned out a balanced points distribution where they can both control Greater Dragon and casting very potent hard to resist dps magic (most of people give up on meditation however it does not make their spells less deadly). Even with the skill cap limitations majority of the players in UO still tried their best to think outside box with the tools they are given to break the traditional only one role at a time status quo. UO has to cap players at 720 points because there is no Deck system. Therefore some restrictions are needed with how many skill you can learn. Before you say swapping deck in SOTA is just a click of a button, well it is more complicated than that and I suggest you to actually play the game to find out the disadvantages of switching your deck to a completely different set of skills/gears. The Deck system perfectly compliments the soft cap/no cap system in SOTA but that is a topic for another time. Again if you try to play the game you'll probably get it. Sometimes I wonder did you actually play UO or SOTA?