If you could pause you would only be able to do it offline, if you could only pause offline, people would play offline for inconvenience. If people were mostly playing offline, then they'd miss a lot of the seemless online interactions that the developers wanted players to experience.
It might be selfish because the developers are sacrificing player convenience for the sake of retaining their vision, but they have reasonable justification to do so.
I get that people like playing these games offline but the online interactions are a big part of the experience and it doesn't make sense to offer additional incentive for players to jump offline. Less players online is a detriment to the experience of everyone that is online, and it's not unreasonable for the developers not to want to sacrifice their vision. A big part of Dark Souls is the community driven tutorialing and interactions via both pvp and co-operative play. If you play offline then you are missing out on all of this, and ultimately, not playing Souls games the way they were designed. If you want to play them offline because of particular reasons, then go for it, but don't expect additional advantages and incentives for doing so.