Imagine a new 17in MBP with 6-8 TB3/USB4 ports!
The problem is that you're unlikely to see that because USB-C/TB3/USB 4 ports are more expensive (both in terms of cost and their requirement for CPU resources like PCIe and internal DisplayPort lanes) to implement. A mixture of port types (as per the LG and the 2012-2015 MBP) is more effective because you don't "block" valuable TB3-capable ports by using them for chargers, displays or USB 2/3.0 devices like mice and memory sticks.
Why would you want 6-8 TB3 ports in a lap top?
...to plug more than 4 things in without needing to carry a hub/dock - especially when just the
charger counts as one of those things and you've got a laptop with limited, non-expandable internal storage that may need an external drive (c.f. the old MBP which had an easily upgradeable HD and space for a second one in the optical bay).
Docks are great on a desk where they can be left in place and semi-permanently wired in, but they make no sense whatsoever for mobile use where they just add an
extra wire to be connected - and proper Thunderbolt hubs are still quite expensive, while cheaper USB-C hubs force everything through the bottleneck of a single USB3.1g1 lane and can't handle 4k and USB3 at the same time... and if you 'commute' between desks you need a hub on
every desk.
If you never need that many ports then good for you - that doesn't mean that nobody else does (and lots of people
don't need to connect 80Gbps worth of dual 5k displays, eGPUs and ultra-fast SSD arrays). Plenty of people here appreciated the third USB on the old 17" MBP (not to mention the ExpressCard slot) and you didn't have to use any of those to connect your charger, external display or (necessarily) storage (with an upgradeable internal HD and space for a second HD in place of the optical drive - plus any modern equivalent would probably have a second TB port instead of FireWire & Ethernet)
Meanwhile
nobody is suggesting
zero TB3/USB-C ports on a 2019 machine (and I think the LG could do with a second one) - so the option of single-port docking isn't going away.
In fact, there's no need for the existing MBP to go away* if people like that - the real problem with the current line-up is the lack of diversity and total obsession with size and weight. Essentially, Apple today only makes "ultrabooks". Last time I looked Apple were #4 in laptop sales, hardly some tiny boutique concern, so they ought to be able to sustain one or two more product lines without turning into Dell.
(* except the keyboard which needs to be staked through the heart, beheaded, soaked in holy water, sprinkled with poppy seeds and buried at a crossroads with one of its socks missing...)
