that depends... if you make something more peopel like that's great, but taking away something I and my group likes sucks. I don't know what is wrong with people... you have likke 5 caster classes in the game and only 1 pact magic class, so taking away the 1 pact magic hurtss those of us that like pact magic.
It is a bad thing to take the 1 example of short rest caster and remove it and put yet another long rest caster in it's place... long rest full and half casters are a dime a dozen.
Wrong with people, hmm? Interesting take. That is what triggered me to respond.
Neither the design team, nor playtest-Warlock lovers, are taking any thing away from you. But I'll get back to that.
First, it's the first public playtest of the Warlock that is not final. The designers will make changes based on the popularity of the content. If you're so confident that more people love the 2014 Warlock, then trust that they will rally and the D&D team will alter course and try a new tact. But this is nothing more than you liking something and others liking something else. You have a responsibility to provide your feedback to get your preferences and suggestions heard. And people who feel differently, who feel that the Warlock design is disruptive to their games, will do the same. You don't have to agree with each other.
If the playtest design is popular and does move away from Pact Magic, it will be because there is more interest in something new being added to the game as another option. But the new does not invalidate the old. You still have your 2014 Warlock with a lot of subclasses, which will still be fully playable alongside 2024 classes. Heck, I bet there will be more (and I bet better) options from 3rd parties who want to continue to support the 2014 design, whether Pact Magic survives or not.
However, if the Warlock design goes back to Pact Magic (because it proved to be a bit more popular after all), but it doesn't fix the issues that other players have with it, those people will never see the finished version of a new Warlock option that they were excited about. Those people don't have a 10-year old class to play that they really like. They will actually have lost something (even if it was less popular than the 2014 version). It's not like the playtest Warlock will be in an SRD for people to riff off of, like the 2014 Warlock is.
The same goes for the playtest druid as well. If the designers go back to Monster Manual scraping, that will suck for a lot of people. But I doubt 2014 Warlock and Druid lovers care about that outcome. Whatever design gets printed, the people who love it will cheer. But the designers have no malice in this. They are running a popularity contest. Popularity is never 100% and someone isn't going to get what they want.
So don't go asking why something is wrong with others. You're not right. I'm not right. We just have different opinions regarding this matter, and are each trying to justify why our preferences are valid and deserve a place in the game.
I know I can get defensive too. But while I quoted you for using the "wrong with people" comment, I'd like to close by saying that both sides should avoid assuming malice from another side, even if we want slightly (or wildly) different things. This isn't a moral or ethical issue that requires umbrage and hostility towards others.