For most stuff, the grind isn’t bad. As long as you try to get 1 thing at a time, the it’s relatively simple. It’s when you look at a list of 10 things and think “I need ALL of this” that it starts getting annoying.
I recommend saving platinum for cosmetics and necessary things like Orokin Catalysts and Reactors, as well as weapon and Warframe slots. And, when they go on sale, affinity or resource boosters to lessen the grinding.
Now, like most people, you’re gonna buy a frame or weapon at one point. Everyone does it. And that’s fine, just make sure you have leftover platinum for buying things you need.
I am presently saving plat for the new Mag Deluxe skin because it looks fantastic. Also, the new Warframe (Gara) because for some reason DE thought
“Naaaaahhhhh it’s totally fine to give her parts a 7% drop chance. People are gonna love this grind!!1!!!1”
Spoilers: We actually dont.
She would be one of the 3 frames I would say it is not a waste of platinum to buy from the store. Honestly.