You need a plugin to have CI+ on OpenPLi whatever the STB brand. On VU+ you need the CI+ certificate file while on some other brand you need a small application running.
You probably think that you don't need a plugin because autorestore does the job for you and restore the certificate.
Pulse4K is also working fine with the CI+ but having CI+ working is a savant combination of timing, different plugin: slowzap for CI and CI assignement, and sometimes some specific setup in oscam dvbapi file.
You can have different issue with different brand and a setup working fine with brand A will not work as-is out-of-the-box on brand B, every settings needs to be tuned.
You can compare CI+ setup with HDMI-CEC setup.
My father is TV addict and he is using both the CI+ and OScam on a Pulse 4K and trust me at the very first problem he had he called me. So if CI+ had problems with the Pulse4K I would be aware.
But of course it is based on my own experience with the CI+ CAM that I can test on my setup.
For you black screen problem install slow zap for CI and enable the Restart service after play (find the ones that needs it) and your black screen problem will be solved.
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Sat: Hotbird 13.0E, Astra 19.2E, Eutelsat5A 5.0W
VU+ Solo 4K: 2*DVB-S2 + 2*DVB-C/T/T2 (used in DVB-C) & Duo 4K: 2*DVB-S2X + DVB-C (FBC)
AB-Com: PULSe 4K 1*DVB-S2X (+ DVB-C/T/T2)
Edision OS Mio 4K: 1*DVB-S2X + 1*DVB-C/T/T2