Sounds like you're taking a stance on something you haven't tried. I get the same thing from my kids about dinner often enough.
Mate, I'm 45. I'm old enough I am perfectly capable of evaluating whether or not I like something without having to try it. For example, I know without having to try I wouldn't like 40K, Rapid Fire, World of Warcraft, Game of Thrones (any version), bungee-jumping, rugby or any form of alcohol you would choose to put in front of me, to pick a selection of random stuff.
Why? You only want to play a unit when they can dominate all they survey? One of the scariest combos I faced was 2 REALLY fast VTOLs with TAG and 2 LRM Carriers with Semi-Guided Ammo. I was effectively running a Level 2 with 3 Celestials, a Wobbie Avatar, and a point of Protomechs. My 'Mechs got destroyed by them.
Because I want to play with my BattleMechs.
That's it.
If I didn't want to play with giant stompy robot toys, I would not be on this board or a BattleTech fan at all.
Sorry, mate, it's just that simple.
My choice of mech purchases has always been 99% based on "do I think the model looks cool?" (The new plastic resculpts are, by and large Much Cooler, and so my selection of mechs has expanded to include mechs I would never have bought the metal sculpt of.) That is why I have not until the kickstarter bought any IS vehicles, because I didn't think the old art looked cool. I am unlikely to ever have a protomech, because I've never seen one I think looks cool. I only have a few Clan vehicles because I thought They Looked Cool (and most of 'em are lights), and only have about a pack of vehicles from the Mercs kickstarter because they have missile launchers that I thought were Cool Enough. (If I ever wanted to use infantry or BattleArmour, I'd be using old Space Marine (from Before It Was Epic) infantry.)
I'll go further and say, I'm sorry, but I don't even take BattleTech particularly
seriously. Frack, mate, everytime I play Clans I roll two D100 on a table of made-up adjective/noun and play them almost as a parody of the worse Jade Falcon steriotypes. (I mean, there's a whole thread called "Bleakbane Ruins BattleTech" in the fan rules section is you wanted to see how seriously I take it all.) I play it because occasionally, I want to play with cool-looking giant stompy robots.
I hesitiate to say it, but when I want to play a game that behaves as a reasonable facsimile of real-world warfare tactics[1], with vehicles and infantry, I play (sci-fi) Maneouvre Group. (In which walkers struggle to survive on account of them simply being too visible even at half the relative height of a BattleMech.) I simply don't look for that out of BattleTech.
Again - and I feel I really must emphasise this again, especially in light of that previous paragraph - that BattleTech does try to have comprehensive rules for everything is a strong point in its favour and I would never advocate it didn't. (Hell, as I've said to people, BattleTech has oddly more in common with Maneouvre Group than either do with most other wargames.) That has an appeal to a lot of folk, and that's cool. And I like that,
even if I choose never to exercise those options, it is there if I ever changed my mind.
But I really am evidence that part of the fanbase is genuinely just here for the cool giant stompy-robots and everything else is secondary to that.
Does that make me a Filthy Casual? I mean, prob'bly? I only get to play solo once, maybe twice a year these days? I don't really play "six-pack and boldy-go" as Full Thrust so elegantly described itself once, but BT is as close as it gets for "casual". I'm invested in the lore really only insofar as it informs the Techinical Readouts (which I love), but really not giving much of a frag about the characters or anything. Does that meet the criterion? You decide.
But, like, at least it makes me an informed filthy casual with 500-odd mechs and about a foot's worth of BT rulebooks. I am well aware of what is on offer and an engaged enough to read the main forums. And, here getting back to topic, I bought both BattleSpace and Aerotech 2 played the latter once and decided, nope, too much like hard work, Full Thrust was still better and I didn't think BT's ships and fighters didn't look particularly cool, so I went back to FT (until I ended up writing my own sets of fighter and starship rules.
[1]Standard proviso: All simulations are
wrong, some simulations are
useful.