In my opinion tower levelling is becoming quite messy if a players aim is to maximise timer and resource use efficiency.
If you ask most people what is the best way to take a dark flak tower from 129 to 130 they will say just level it up once.
Well if you do that you will waste 25 days in timers.
It is much more efficient to instead level up an ice or fire turret to L25 and merge that into your dark flak.
source Neon War Dragons
And the problem is as towers get bigger and bigger that this problem gets worse because the timer costs increase but the XP doesn’t.
Chart 1 : Raw - Toee timer costs with XP gained
Chart 2 : Efficiency- XP earned over timers spent
The problem is that XP and timers travel together quite nicely until level 53. Tower level 53 grants 106k xp per tower but unfortunately XP never increases from tower level 53.
This is due to tier based scaling which is an important mechanic so that new players can have a meaningful impact within 12-24 months instead of 3-4 years.
It is crazy that levelling a tower from 53 to 54 gives exactly the same XP as levelling a tower level 129 to 130 given the huge difference in timers needed and that a L130 tower is ridiculously more powerful than a L54 tower.
Imagine playing a game where one hitting a weak goblin gives the same XP as killing an end game dragon… that is what is happening here and it’s kinda frustrating.
So anyone leveling towers beyond 75 is paying a high efficiency premium and that premium gets more and more expensive as we progress tower levels up.
As a player it is becoming quite tedious to work out an efficient levelling path - it shouldn’t be this complex.
The main issue in my opinion is that XP doesn’t follow tower level. I think for all future tower levels that XP needs to move up with the tower level if timer cost increases.
Or if this is not possible then timer costs should stay stagnant with XP also being stagnate.
Having one increase and the other remain static is in my opinion very problematic especially as we hit even higher tower levels.