Well, from writing stand point each evolution lvl up should feel like we earn it
I get this feeling with lvl2 and i get this feeling with lvl3 (after fights against Jake, Deryl, several tough monsters in between, Valvaran, hardcore training and huge all-out war against monsters)
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But lvl 4 in first tough battle? This sound cheap to me
That's honestly part of the reason I dislike Xanthe's serum, and why I FEEL like the monsters also shouldn't like it.
For how "limited" and "specific" or "worthy" you have to be in order to evolve to Lvl 5, it sure is EASY to just get a fuckin serum and jump the hoops.
Oh I'm sorry was the Arbiter, 3rd, and 4th trying to get you to fit a requirement for future plans or make sure you were ready for a deal or something? Well not anymore! We can just take a quick stab and tada!
What do you guys prefer? A bad ass transformation and fight to dethrone a power hungry crime lord (Klaus Lvl 2 Evo). Or perhaps a duo Evolution between you, and your best friend, travelling across the battlefield filled with Monsters and mayhem. Nah, I'll take this old guy stabbing me with a needle where I throw a fit in a naked tussle for about 10 minutes, and even THAT was just to observe, Xanthe could alternatively just lock us up in a fuckin room for PEAK entertainment.
Narratively they also sort of provide plot progress markers. I highly DOUBT W.W will continue the story for a lengthy amount of time after we resch Lvl 5, as that is by definition the end game of a Superhuman's strength, there would be very few to stand in our way. So if we get to Lvl 4 and then a lil half arc after just get a fuckin serum we'll be skipping the last bit of huge content stretch possible through an anticlimactic procedure. Realistically it makes sense that an Evolution can happen WHENEVER (i.e without a grand spectacle) but let's be honest with ourselves; that's fucking boring. Could you imagine the spectacle that was Michael getting his powers, turned into him shitting on the god damn toilet and figuring it out?
Fuck the serum.
Edit: It's not ALL bad, the serum that is. I like the way W.W buffed Michael & Tiffany so that they can "keep up" with our current cast in future fights together. Though again, for someone like Michael, who literally went through a whole process to FIGHT a monster as a human just to prove a point to himself it does feel..."cheap" to just give him his 2nd Evolution through a bottle.