People nowadays have more sense of entitlement than ever before. They also hate change and tend to ally themselves with companies in some odd way they feel benefits them.
Take Apple for example, I know many people who refuse to buy anything that isn't an Apple product. Steam has a similar grasp on the Digital platforms and some will defend it regardless of reason. People who hate Epic Store are likely to have hated the uPlay store, Origin and any other platforms that appear. I won't defend paying for exclusivity as it is a bit of a poor move but I also understand they are the new guys trying to make an impact against a company that has a monopoly on the market so I can understand they are doing what they need to do to get a foothold.
I see no point in cutting off my nose to spite my face and not buying things I want just because they aren't on steam though. Competition is a good thing and in the long term having major platforms competing for our business can only be a good thing for us.
The deal with Phoenix Point was shady because:
1. The game was crowd funded by people, not paid for by Epic to develop it.
2. The "cash payout" meant that the developers/publishers were happy to annoy the backers, many of which would have preferred Steam or GOG.
3. The backer site originally said backers would get a Steam key I believe, which turned out not to be true.
The devs/publishers are looking after number one at the expense of customer goodwill.
The 88/12 split sounds great for devs, but they are missing a trick. If that 88/12 split also let the customer pay a lower price, then it would make sense. Otherwise for a consumer the price seems to be much the same right now.
If a game is good, it will sell well, I'd prefer to see titles release on all major platforms if possible. Steam still has the biggest influence in terms of numbers of people on the platform.
Epic is still too far behind on development to keep up with many (basic) Steam platform features, biggest examples are lack of user forums. People are taking to the Steam Borderlands 2 forums to raise issues with Borderlands 3, because Epic doesn't have forums, and Steam doesn't have Borderlands 3.
For me it's gotten to the point where I simply won't buy any titles that are Epic exclusives. It would take a truly fantastic exclusive for me to make the switch (i.e. Cyberpunk). But CDPR know that their customer goodwill is very high, and an exclusive deal would turn the community against them.
If Epic want to take on exclusive games, they should either directly fund them earlier in the dev cycle, or they should give people way more notice than they often are.