@Stacy555 63 yo kid who started playing rpgs from 2005. tank/heal/dd is newer version of what im saying.
Actually, Tank, Healer, Damage Dealer were terms used in Ultima Online, and EverQuest, arguably the first MMORPGs out there, and they had already started in use in TTRPGs before it went digital...This coming from a TTRPGer since 1978.
Your Classic Trinity was actually Magic-User, Fighting Man, and Thief (OD&D, 1974 white/beige booklet edition)
It has evolved over the years, but it got boiled down to Tank (Damage Sponge), Damage Dealer, and Support (Healer/Enchanter, Buffer, Skill-jockey)
It actually changed to a 4 part system really, not in direct link to the Rock-Paper-Scissors analogy, in fact, as they quickly differentiated between the Healer-Support person and the Skill-Jockey Support person. That goes to when they added in the Cleric to D&D. The 4 ultimate CORE classes thus were Fighter, Cleric, Wizard/Mage/Magic-User, and Thief/Rogue and all other classes were built around the roles those played. It finally really got highlighted in an actual D&D edition in 4th edition, and players were up in arms because they believed that D&D was devolving into an MMO clone, forgetting that MMOs came from D&D in the first place, and all they were using were different terms than SOME might have been used to. In 4th Edition, it was the Defender (Tank), Striker (DPS), Controller (Blaster, Mage, Area Attacker), and Leader (Healer, Support, Strategist)
So no matter how old someone is in the game, don't go throwing your age around and degrading others for being newer than you. Stacy555 had a valid argument, and your dismissal was not exactly good form.
As to the Rock-Paper-Scissors mechanical theme, no thank you, I like every character to try to be dynamic, by how a person plays that character, and if someone wants to start an Arcanist, and then unlock a bunch of Melee skills to switch-hit at times, good on them! That's why this game is built around the Pre-Set system for Skills/Spells and Talents