Short answer: yes, but not for the reasons most people say.
The standard argument is consistency � burr grinders produce uniform particle size, blade grinders don’t. This is true. But the more practical reason is that a decent burr grinder forces you to actually dial in your coffee, which teaches you more about what you like than any amount of reading.
What I use
A mid-range hand grinder. Slow, but the grind quality is genuinely good and it travels well. For home espresso I’d want something electric, but for pour over the hand grinder is fine.
What to buy
Spend around $100-150 USD. Anything below that is marginal improvement over a blade grinder. Anything above is diminishing returns unless you’re going deep on espresso.