>>34738407I mean, you have to go with the games in this case like you should go with the games for pokemon.
The latest game (Cyber Sleuth: Hackers Memory) uses a pretty pokemon esque system, where you have to level up to a certain level to evolve your monsters. The main differences being that you can devolve your digimon at any level to any devolution (theres generally 2-5 available) that allow you to cross breed skills and gain the best ones and that each digimon has exclusive and shared evolutions creating a complicated branching of paths to take.
The biggest difference though is that to evolve into certain, more powerful digimon, you have to meet hard to reach stat criteria, like attack, hp, speed etc (theres a system like a daycare built specially to increase these stats). This allows you to specialise each digimon as you can tell by the criteria generally what stat the digimon will have as its highest.
An annoying stat that the strongest digimon want a lot however is Ability, which is ONLY increased by evolving and devolving high level digimon. Im at around the level 50's mark with my digimon in game and I had to grind for around 1 hour and a half to get up to 40 ability to get the next strong evolution for each of my digimon.
Theres definitely a lot more to think about when playing digimon when it comes to engineering your team.
So back to your point, in the game you can theoretically continuosly evolve when needed then devolve which eventually would allow you to evolve into even better forms but the show is obviously treating it like a mega evolution where the digimon can evolve for a short time but cant maintain it.