I was using Postman myself and I got really upset about their change and forced limitations, on the other hand I understand their needs to charge people for monetisation.
The most upsetting thing about Postman was the impossibility to use multiple client certificates for TLS authentication, but only one for domain.
Although JMeter isn't as pleasant as the other tools are, speaking of UI, it is capable of supporting multiple protocols and there are no limitations in using TLS certificates or checks.