Not really. I want to be able to look at 3 different products from 3 different providers and compare them not just today, but also in 2, 5 or 10 years time. If they are pegged to something/anything, then this comparison is possible
Bank A offers 2% above EURIBOR
Bank B offers 1.5% above EURIBOR but has a 1000 arrangement fee
Bank C offers 3% above EURIBOR but offers a 1000 cashback deal
It allows me to compare beyond a point in time
Today, given the nature of SVR's they are based on thin air, and can change the day after drawdown just because the bank feels like it. A best deal today may be the worst deal tomorrow and visa versa. Its about making decisions on products, but making intelligent ones
BTW, I do agree that any mortgage should be a secured loan on an asset, and this means the bank should be able to claim the asset in the event of non-payment. This is why a mortgage traditionally has a lower interest rate than an unsecured personal loan. I also appreciate this is not the case today for a variety of personal reasons. This is a different issue that baselining an SVR on something solid
As @Sarenco says, this is not uncommon practice on commercial loans
Euribor/Libor is indeed common practice for most non-consumer loans. Not sure why that can't be the same for SMB or consumer loans. I'd guess it's due to a number of factors.
Bargaining power & historic custom/practice. Commercial loans will be negotiated and a random figure plucked out of thin air (SVR) isn't going to provide an FD with certainty. Also commercial borrowers need to be able to hedge their debt so need comparable base rates for their swaps.
Similar to the issues with trackers, the bulk of Irish Bank liabilities are now (customer deposits and fixed rate bonds) not Euribor linked. How many consumer deposit accounts pay a specific rate rather than Euribor +10bps or Euribor - 10bps? None that I'm aware of.
Euribor/Libor linked loans would be great (I'd love one) but without dedicated long term matched funding it doesn't make sense to match your base rate on a long term loan to something you may or may not have access to in 10 or 15 years.