These adapters are suitable for the majority of people. If you need more then you'll have to suck it up and buy the hub powered adapter. Like I thought, you hadn't communicated your requirements fully, so it's a constant moving target: you now disclose you need bi-directional adapters. :-\
Apple have done their market research and deemed that HDMI port is suitable for the target market of the Mac mini.
Again, consider that the Mac mini really isn't the machine you need, and something else will be more appropriate.
It is
really hard to believe this post is meant seriously, but it's been deemed 'legitimate' so when in Rome..
It's not about me "needing a bidirectional adapter". When I said that adapters FROM a HDMI source/computer TO a DisplayPort or USB-C display are neither cheaply available nor portable,
you replied that they are, and linked to several adapters that go FROM a USB-C source/computer TO a HDMI display.
I only mentioned "they are not bidirectional" because
if they had been bidirectional adapters, they would work for either use-case. But they aren't, so they don't. All you've done is highlight their ubiquitous and cheap nature, which is why there is no need for a dedicated HDMI port. Just the same as why there's no need for a dedicated ethernet port: USB-C to Ethernet (or TB3 to 10G Ethernet) are things that are possible and exist
for those that need them. Ethernet to <anything else> is not a thing that exists or is possible.
The mini isn't the computer being discussed here, is it? It's merely an example, or evidence of Apple's previous and still current approach to a hardwired HDMI port in a device with an integrated GPU.
Why is it so hard for you or others to admit that
any Mac - which would include a hypothetical Arm MBP16 with a physical HDMI port - that has any of its display outputs hardwired to a physical HDMI port, is less capable and thus less useful to potential owners, than one which has those outputs routable to any of the USB-C/TB3/USB 4 ports, which can be cheaply adapted to HDMI?
You can even say "yes that is the case, but I still want HDMI". People have different priorities.
Lastly, if your logic on the Mac mini is that Apple have done market testing, and thus the product is "suitable for the target market", that means there's nothing wrong with the current TB3-only Macbook Pro's. They've obviously done their market research and deemed that TB3 is
suitable for the target market.
You can't have it both ways. Either they are capable of making mistakes in every device, or every device they produce is perfectly matched to it's "intended market".