$luw$:{I} [loose|destroy]
$eluon$:{I} [loosed|destroyed|was loosing|was destroying]
$elusa$:{I} [loosed|destroyed]
$leluka$:{I} have [loosed|destroyed]
$lusw$:{I} will [loose|destroy]
$luswn$:[loosing|destroying]
$lusas$:{having} [loosed|destroyed]The worst part of this format is probably that if you did "quiz english greek" it wouldn't accept any form of accent or breathing marks, even though these are also standardized in beta code and some people would probably try to type them, like "e)luon" to show that there's no /h/ sound at the beginning of that word. And I don't think typing beta code in between dollar signs is a very common convention today, but the quiz would require it; you can't just type "luw", you have to type "$luw$".
If we are using two valid ending forms of Subjunctive (-era/-ese) since forever, IDK why couldn't we set these irregular verbs back to regularity.
The Spanish conjugations -ar, -er, and -ir derive from Latin conjugations, which are usually analyzed as having four different regular conjugation patterns (there are long and short e, giving -ēre and -ere, in addition to -āre and -īre), although one can choose to make additional distinctions.
Generally older Indo-European languages have more complex morphology than newer ones, including more paradigms and more irregular forms. Ancient Greek verbs are definitely morphologically more complex than modern Spanish verbs.