I'll give you one example, and you can decide for yourself.

Mid of this year, I accidentally found out about a great independent language learning app [1]. It clicked for me. It was no bullshit, no gamification, and no distraction. I used it for one or two months, 700 hours in total. I can attribute to it some progress in learning my target language.

Then I went on vacation for a few weeks and completely forgot about it. Today I tried to find it again, but since I forgot its name, I couldn't find it easily. Normally, I would search my inbox, but there was not a single mail from it. When I found it, I learned it improved quite a bit and added a way to support the app through subscriptions.

Now, if it had some promotions or gamification built-in, I would be reminded of its existence and would most probably have been using it at least 700 more hours until today, and maybe even subscribed to it. And it would bring me closer to reaching the learning goal in my target language.

TL;DR: Yes, some gamification or nagging is necessary. But don't overdo it.

[1] https://morpheem.org/