Maybe your fermenter is a carboy with a narrow mouth...
Back in the ancient olden days of yore, a hot topic of conversation was identifying the widest-mouthed funnel known to humanity. Sorta like the contemporary BFW meme...but before there were memes.
I'm old, cut me some slack. What were we talking about?
Oh, right! I've poured and splashed and cussed, and poured and splashed and cussed, and poured and splashed and cussed, and mopped the floor more times than I can remember while making many decent enough beers in my trusty old 6-gal glass carboys. If you want to get a big funnel and pour, that works. Go ahead and do it! I can assure you, your beer will not end humanity if you do it that way.
Pouring into your fermenter became a much less attractive option when step bits and weldless bulkhead/ball valve assemblies became much less expensive about twenty years ago. A step bit and a bulkhead/ball valve will run you about forty bucks, for the pair, these days. A several-lifetimes' supply of food grade machine oil costs another twenty bucks. The bulkhead and the bit will last for decades, compared to an autosiphon which is good for maybe, at most, three years...if you don't brew very much?
At this point, I think the bulkhead and valve arrangement has become so ubiquitous that most brewers start with that configuration on their rig. It makes things a whole lot easier, buy a bit and a bulkhead--it'll blow your mind. It certainly blew my mind.