I always (okay not at the newborn stage, but from ten months old or so) found it easier having more children in the room than just one.
I didn't like leaving my dc1 but needed to earn money and anyway didn't want not to have my own independent income, so I registered as a childminder when she was nine months old and minded two other under twos ten hours a day, five days per week from then until dc2 was born.
I actually found that, even though they were all too young to genuinely play "together" they were occupied and intrigued by one another and parallel play was vastly more engrossing to them than solo play and brought different benefits than me just playing 1:1 with DD (it's a real skill not to be adult led playing 1:1 with a toddler and adult led play is very limiting but the "easy" or lazy option for the child so a lot of children default to it when it's "on offer" and don't explore and create their own games as much).
When dc2 was born I stopped childminding (dc1 was 2) but went to lots of groups for dc1 - still until dc2 was old enough to play with she really missed her "friends" and asked for them to come back. It really was in many ways easier to have three toddlers than one!
Of course if you have more children it's easier to internally justify the fact you're focusing on childcare and (informally and not in an intense way obviously) educating your children rather than getting frazzled and stressed trying to get lots of domestic work done when you are home with the children. I liked that too!
I had a slightly bigger gap from dc2 to dc3 (similar to the gap you're anticipating) and I must admit it was longer until dc2 and 3 played together and I did feel for longer as though I had two children and then a separate "only" and had to keep dc3 from destroying the older children's more complicated games and toys and crafts for the first 2.5 - 3 years. So it is longer until the "pay off" with a bigger gap.
DC1 loved dc3 the way she'd have loved a puppy and with a 5 year gap from dc1-3 they were never really peers - it's definitely not easier having a 6 year old and a one year old than just a six year old, although there are of course still wonderful things about the relationship.
So it depends a lot on the gap.
If you struggle with one though you don't have to have more and it might not be the right choice. It's more environmentally friendly just to have one child and they're more portable, you can spend more money on them and more time (though if you're inclined to be intense this is a double edged sword) and leave them your home all to themselves when you die...