I had PMS when I first inherited accounts from my dad. He'd been in very poor health for the last decade of his life and really never understood how to invest anyway, so he had been using Fido's professional management. I went along with it for around 6-ish months while I got up to speed on how to invest (and discovered index investing and all that fun stuff).
I stayed with Fido, but I took over my accounts once I got my asset allocation figured out. They had me in something like 30+ different funds, and they were constantly buying and selling in lots of hundreds or maybe a few thousands each month. Once I noticed this, it pissed me off but they really enjoy micro-rebalancing in PMS (which is borderline churning). The constant buy/sell wasn't generating huge fees since most of the PMS funds were proprietary (you will not be able to hold them if you choose to self manage) but it was annoying and pointless to rebalance each month and I honestly think it was just their attempts to look busy and show they were "providing value" by trading constantly.
So based off my own experience, yes, you should fire them and simplify as soon as you get your own AA figured out.
I promise you can make a perfectly decent portfolio using just 2-5 funds to fit any asset allocation and pay well under 0.25% even using Fidelity's fund families. They have a pretty fantastic assortment of index funds and even managed funds that aren't super high ERs. Unless you have issues with checking in on your portfolio a few times a year and doing very basic math - there is no need to continue paying the professional management costs. (I could see them being useful for sickness or inability to grasp basic math and investing principles).
https://www.bogleheads.org/wiki/Fidelity
^use this to figure out what funds fit your AA
I have a 85/15 stock/bond allocation (tiny bit of cash in a savings account I lump into the 15%)
I hold three funds* across my entire portfolio:
Fidelity Total Market Index Fund (FSTVX)
Fidelity U.S. Bond Index Fund (FSITX)
Fidelity Real Estate Index Fund (FSRVX)
The Real Estate fund isn't even necessary but I have it just to say I have a small amount in property since I don't want to hold physical property or be a landlord.
*in the interest of being completely honest, I do have a tiny amount (under 1%) in a growth fund that was a leftover of my pre-index investing days. I consider it my gambling fund and do not invest any new money into it, but I still enjoy watching it bounce up and down crazily.