Most End Users find it a very steep learning curve to move from cPanel to ISPConfig, and would rather pay the price difference than lose a whole bunch of unpaid time learning something new.

As for SysAdmins, I'm sure I'm not the only one who remember a new release of ISPconfig that had major problems, and was further compromised by the previous version's download having already been deleted from the ISPconfig site, and the ISPconfig support folks saying that it was impossible to bring it back thanks to the software they used.

All that said, with a few years having passed since then, ISPconfig was the best of the free control panels for my purposes (Development), but I finally decided to manual installation as I was needing to test beta versions of software, e.g. - PHP, and that wasn't very easy with ISPconfig.

ispconfig is opensource, if you want to download the previous version, just go to their git and select the version you want, unless it's an obsolete unsupported version, which is a concern

I'm not sure that end users would prefer a "better UI" over having 99.999% uptime HA
it only makes sense if ispconfig is offered without HA versus cpanel,

it's not about the price, cpanel despite drawing in so much revenue, does not support ha clustering, so much for an expensive paid product

Highly Available cPanel based services are possible. There are providers that offer it.

Just because it’s not built into the panel doesn’t mean it’s not doable.

Quoted from Guest on Tuesday, 16 September 2025

Highly Available cPanel based services are possible. There are providers that offer it.

Just because it’s not built into the panel doesn’t mean it’s not doable.

does it use a 3 node solution from proxmox or similar? LOL

Quoted from Guest on Tuesday, 16 September 2025

does it use a 3 node solution from proxmox or similar? LOL

There are a myriad of ways to go about it.

Cpanel’s been the “default” for so long that hosts and end-users just stick with what they know, even if it’s pricey. ISPConfig’s clustering is a huge selling point, but it does take more tinkering and know-how to get set up right.

It’s kind of like people paying extra for a familiar brand instead of trying something that might actually suit them better.

Do you think if ISPConfig put more focus on polishing the UX and onboarding, more people would give it a shot?

Quoted from Guest on Tuesday, 16 September 2025

As for SysAdmins, I'm sure I'm not the only one who remember a new release of ISPconfig that had major problems, and was further compromised by the previous version's download having already been deleted from the ISPconfig site, and the ISPconfig support folks saying that it was impossible to bring it back thanks to the software they used.

My apologies to ISPconfig. My aging memory failed me. It was Duplicity (backup software) where this problem occurred.

Quoted from Guest on Tuesday, 16 September 2025

There are a myriad of ways to go about it.

it's either done on the filesystem&database level or the underlying vm level

what are the "myriad" ways you're referring to?

Quoted from Guest on Tuesday, 16 September 2025

Cpanel’s been the “default” for so long that hosts and end-users just stick with what they know, even if it’s pricey. ISPConfig’s clustering is a huge selling point, but it does take more tinkering and know-how to get set up right.

It’s kind of like people paying extra for a familiar brand instead of trying something that might actually suit them better.

Do you think if ISPConfig put more focus on polishing the UX and onboarding, more people would give it a shot?

it would definitely be a boost and attract people who are used to overpriced wp engine with low performance
having high na with high frequency cpus is certainly welcome

I'm not sure that end users would have any clue what you're talking about.

"What control panel do you use?"

"The one my host has."

"When did you last log in to it, and why?"

"Last year, I needed to add an email account for my brother to use".

You're not going to conscript end users to persuade hosts to convert to your favourite control panel. You need to find a different way.