Since it is strictly singleplayer the amount of time someone else spends grinding has zero influence on your enjoyment of the game.
That is not the issue. The issue is to stop excessive grinding for whatever reason, even if the player may enjoy grinding itself or grudgingly tolerates grinding as a means to the end he wants (usually power).
I like the hard cap. It puts a limit to compulsive grinding done by perfectionists who think no such thing as too much power (or do not feel perfect without having everything). For people who are hardcore and have lots of free time, their level cap may be much higher than someone who is casual or who (may be hardcore but) cannot afford the time to grind characters. It is nice (and possibly refreshing these days) for a game to say "You played enough! You have enough power! Beat the game with what you have and play something else or get a life!"
I for one am glad people who pay money for games are treated as the dirty addicts they are. Now if only we could make the game shut itself off every 1 hour and tell the player he needs a break and also limit to 2 hours per day. Finally the game should permanently uninstall itself after 50 hours of total gameplay and we could have the nanny game we all deserve.
Let me just say this: whatever the level cap ends up being, it'll be super easy to change if you want to.
How easy? In an ideal case I would just have a soft cap where gaining additional levels becomes harder. This is not so I can get the power I need or grind because I feel incomplete, but so I can continue playing and have a sense of progression.
Zero-flux bonus at up to 1% flux. So, can keep it while shields are on and while firing beams, but that's about it.
Rip speed builds. Used to be able to make a specific build with maxed out vents and capacitors to be able to fire Gauss cannons on conquest while keeping the speed bonus.
I just hope the "perks" don't end up with League of legends favor, where you get +2% here and another +1% there and +10 hp there. Yes, you have a statistical advantage, but it doesn't feel significant.
Another concern is that a lot of the times what ever "overpowered" thing gets nerfed that only forces people to move to something else(so at best you are forcing people to change playstyles) which leads to that thing getting nerfed as well, which leads to everything being watered down. This kind of thing is cancerous as it is in PvP games and I come to single player games to avoid that. Hope that's not how it will end up feeling in the end.