If what you say is true, why would Apple ever force a switch to eSIM? I’m now less likely to buy a new iPhone because I don’t want to deal with this eSIM fiasco. It’s to their detriment. If their goal is to sell more phones, they would want to eliminate all friction to switch to a new phone. So what you are saying doesn’t add up.

Less space occupied, more battery, smaller phones.

It wasn't the only reason, but was at least one of the stated reasons for the jack removal.